rse: enable per platform DMA ICS

Allow platforms to have their own DMA ICS by overriding the
RSE_DMA_ICS_CONFIG_PATH cmake variable (through the relevant platforms'
config.cmake file) to point to a custom dma_config.yaml file.

If a platform does not specify its own  DMA ICS then it will take the
common one in
/tf-m/platform/ext/target/arm/rse/common/bl1/scripts/dma_config.yaml

Signed-off-by: Gautham Ravichandran <gautham.ravichandran@arm.com>
Change-Id: Ie4f6b7a696870769986298af2e11b2378f298632
2 files changed