ti-u-boot: update with am57x support and pinmux fixes
ti-u-boot: update with am57x support and pinmux fixes

Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>

tylerwhall/meta-ti,joelagnel/meta-ti,joelagnel/meta-ti,joelagnel/meta-ti,tylerwhall/meta-ti,joelagnel/meta-ti,rcn-ee/meta-ti,rcn-ee/meta-ti,RedFIR/meta-ti,RedFIR/meta-ti,tylerwhall/meta-ti,tylerwhall/meta-ti,RedFIR/meta-ti,RedFIR/meta-ti,rcn-ee/meta-ti,rcn-ee/meta-ti