rse: DMA ICS: Use bitfield setting for CH.TRIGINCFG registers

This update improves code readability and provides a reference
implementation for future ICS development. Using the bitfield setting
feature aims to increase robustness and maintainability of ICS
development.

Signed-off-by: Gautham Ravichandran <gautham.ravichandran@arm.com>
Change-Id: Ib8adddef1f31ddd21d0036bb4f9c8ebb180fde25
6 files changed