base: fix memory read
base: fix memory read

Now that we use 'clean' instead of 'flush' we need to 'invalidate'
before reading.

The real change to 'clean' hasn't been done yet.

Signed-off-by: Felipe Contreras <de77a8b9cd239b204c19c52ed62e48ab47243362@nokia.com>

felipec/gst-dsp,community-ssu/gst-dsp,felipec/gst-dsp,community-ssu/gst-dsp,community-ssu/gst-dsp