arm: dts: k3-j721e-main: Add MAIN domain R5F cluster nodes

arm: dts: k3-j721e-main: Add MAIN domain R5F cluster nodes

The J721E SoCs have 3 dual-core Arm Cortex-R5F processor (R5FSS)
subsystems/clusters. One R5F cluster (MCU_R5FSS0) is present within
the MCU domain, and the remaining two clusters are present in the
MAIN domain (MAIN_R5FSS0 & MAIN_R5FSS1). Each of these can be
configured at boot time to be either run in a LockStep mode or in
an Asymmetric Multi Processing (AMP) fashion in Split-mode. These
subsystems have 64 KB each Tightly-Coupled Memory (TCM) internal
memories for each core split between two banks - ATCM and BTCM
(further interleaved into two banks). There are some IP integration
differences from standard Arm R5 clusters such as the absence of
an ACP port, presence of an additional TI-specific Region Address
Translater (RAT) module for translating 32-bit CPU addresses into
larger system bus addresses etc.

Add the DT nodes for these two MAIN domain R5F cluster/subsystems,
the two R5 cores are each added as child nodes to the corresponding
main cluster node. Configure SS0 in split mode an SS1 in lockstep mode,
with the ATCMs enabled to allow the R5 cores to execute code from DDR
with boot-strapping code from ATCM.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>