arm: ti: k3: Resync dts files and bindings with Linux Kernel v5.14

This resyncs the dts files for all of the currently in-tree K3
platforms, along with relevant bindings, with the v5.14 Linux Kernel
release.  Of note are that the main-navss/mcu-navss nodes were renamed
to main_navss / mcu_navss and so the u-boot.dtsi files needed to be
updated to match.

Tested on j721e_evm and am65x_evm.

Signed-off-by: Tom Rini <trini@konsulko.com>