dmaengine: sh: rz-dmac: Add reset support

dmaengine: sh: rz-dmac: Add reset support

Add reset support for DMAC module found on RZ/G2L alike SoCs.

For booting the board, reset release of the DMAC module is required
otherwise we don't get GIC interrupts. Currently the reset release
was done by the bootloader now move this to the driver instead.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20230315064501.21491-1-biju.das.jz@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>