dmaengine: sh: rz-dmac: add r7s72100 support

This SoC needs to make getting resets optional. Descriptions are
reworded to be more generic.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20241007110200.43166-8-wsa+renesas@sang-engineering.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>