dmaengine: iop32x-adma: Remove a leftover header file

dmaengine: iop32x-adma: Remove a leftover header file

The Intel IOPx3xx platform was completely removed in commit b91a69d162aa
("ARM: iop32x: remove the platform"), and it'd be safe to remove an unused
and leftover platform data specific header file dma-iop32x.h also.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260114051508.3908807-1-vz@mleia.com
[vkoul: fixed subsystem tag]
Signed-off-by: Vinod Koul <vkoul@kernel.org>