recipes: gstreamer-ios-templates: do not uppercase plugin names
recipes: gstreamer-ios-templates: do not uppercase plugin names

Use lowercase names for the plugins registering functions, as
their names are.

Also adds missing headers to the gst_ios_plugins.c file, so that
the defines/function are correctly found and used

ikonst/cerbero,jackjansen/cerbero-2013,GStreamer/cerbero,cee1/cerbero-mac,ramaxlo/cerbero,atsushieno/cerbero,brion/cerbero,ikonst/cerbero,ikonst/cerbero,lubosz/cerbero,centricular/cerbero,brion/cerbero,OptoFidelity/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,nirbheek/cerbero-old,flexVDI/cerbero,superdump/cerbero,EricssonResearch/cerbero,jackjansen/cerbero-2013,nirbheek/cerbero-old,ramaxlo/cerbero,fluendo/cerbero,cee1/cerbero-mac,BigBrother-International/gst-cerbero,centricular/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,jackjansen/cerbero-2013,atsushieno/cerbero,multipath-rtp/cerbero,fluendo/cerbero,BigBrother-International/gst-cerbero,justinjoy/cerbero,sdroege/cerbero,jackjansen/cerbero-2013,brion/cerbero,nzjrs/cerbero,atsushieno/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,OptoFidelity/cerbero,fluendo/cerbero,BigBrother-International/gst-cerbero,ikonst/cerbero,AlertMe/cerbero,GStreamer/cerbero,sdroege/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,nirbheek/cerbero,superdump/cerbero,multipath-rtp/cerbero,AlertMe/cerbero,multipath-rtp/cerbero,nirbheek/cerbero-old,ramaxlo/cerbero,jackjansen/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,ramaxlo/cerbero,centricular/cerbero,ford-prefect/cerbero,nirbheek/cerbero,justinjoy/cerbero,jackjansen/cerbero-2013,multipath-rtp/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,ylatuya/cerbero,cee1/cerbero-mac,nirbheek/cerbero-old,shoreflyer/cerbero,nirbheek/cerbero,shoreflyer/cerbero,flexVDI/cerbero,EricssonResearch/cerbero,atsushieno/cerbero,sdroege/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,AlertMe/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,lubosz/cerbero,nirbheek/cerbero,nzjrs/cerbero,shoreflyer/cerbero,GStreamer/cerbero,centricular/cerbero,ford-prefect/cerbero,shoreflyer/cerbero,EricssonResearch/cerbero,ford-prefect/cerbero,justinjoy/cerbero,BigBrother-International/gst-cerbero,centricular/cerbero,ford-prefect/cerbero,ylatuya/cerbero,EricssonResearch/cerbero,sdroege/cerbero,flexVDI/cerbero,ramaxlo/cerbero,sdroege/cerbero,jackjansen/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,cee1/cerbero-mac,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,brion/cerbero,davibe/cerbero,lubosz/cerbero,BigBrother-International/gst-cerbero,multipath-rtp/cerbero,atsushieno/cerbero,brion/cerbero,jackjansen/cerbero,OptoFidelity/cerbero,flexVDI/cerbero,shoreflyer/cerbero,nzjrs/cerbero,nzjrs/cerbero,lubosz/cerbero,EricssonResearch/cerbero,ylatuya/cerbero,davibe/cerbero,flexVDI/cerbero,fluendo/cerbero,davibe/cerbero,superdump/cerbero,fluendo/cerbero,OptoFidelity/cerbero,GStreamer/cerbero,nzjrs/cerbero,davibe/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,ylatuya/cerbero,justinjoy/cerbero,superdump/cerbero,ikonst/cerbero,jackjansen/cerbero,GStreamer/cerbero,AlertMe/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,AlertMe/cerbero