arm: mach-k3: {am6/j7}*_hardware.h: Expose MCU R5 proc and device ids

arm: mach-k3: {am6/j7}*_hardware.h: Expose MCU R5 proc and device ids

Currently the MCU R5 processor ids and device ids are only defined for
R5 SPL Stage. Expose these ids always so that A72 SPL can utilize this
information to shutdown MCU R5 Core 1 when booted in Split mode.

Signed-off-by: Beleswar Padhi <b-padhi@ti.com>
Reviewed-by: Neha Malcom Francis <n-francis@ti.com>