ARM: dts: Add support for dra762 abz package

dra762 abz package is pin compatible with dra742 and few peripherals
like DDR with upgraded speed. Add dt support for this SoC.

Reported-by: Praneeth Bajjuri <praneeth@ti.com>
Tested-by: Praneeth Bajjuri <praneeth@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
[khilman: forward port from ti-linux-5.4.y]
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>