dmaengine: mmp_tdma: drop unnecessary OF node check in remove

dmaengine: mmp_tdma: drop unnecessary OF node check in remove

The driver does not support anything but OF probe since commit
3b0f4a54f247 ("dma:mmp_tdma: get sram pool through device tree").

Commit a67ba97dfb30 ("dmaengine: Use device_get_match_data()") later
removed most remnants of platform probing except for an unnecessary OF
node check in remove().

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20251120114524.8431-8-johan@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>