dmaengine: cirrus: ERR_CAST() ioremap error

dmaengine: cirrus: ERR_CAST() ioremap error

ep93xx_dma.c:1354:37: sparse: sparse: incorrect type in return expression
				      (different address spaces)
ep93xx_dma.c:1354:37: sparse:     expected struct ep93xx_dma_engine *
ep93xx_dma.c:1354:37: sparse:     got void [noderef] __iomem *regs

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409202250.fPlN2Erd-lkp@intel.com/
Fixes: 4e8ad5ed845b ("dmaengine: cirrus: Convert to DT for Cirrus EP93xx")
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Link: https://lore.kernel.org/r/d4b542f1d678796fbf094ebcc77295af3617bca0.camel@gmail.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>