dmaengine: mmp_tdma: drop unused variable 'of_id'

Recent change a67ba97d ("dmaengine: Use device_get_match_data()")
cleaned up device tree data calls but left an unused variable, so drop
that

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: a67ba97d ("dmaengine: Use device_get_match_data()")
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20231010065729.29385-1-vkoul@kernel.org


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