dmaengine: apple-admac: Set src_addr_widths capability

[ Upstream commit 6e96adca ]

Add missing setting of 'src_addr_widths', which is the same as for the
other direction.

Fixes: b127315d

 ("dmaengine: apple-admac: Add Apple ADMAC driver")
Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Link: https://lore.kernel.org/r/20230224152222.26732-3-povik+lin@cutebit.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>