dmaengine: sa11x0: use correct print specifiers for u32

This driver when compiled on 64 bits gave warnings:

drivers/dma/sa11x0-dma.c:494:2: warning: format ‘%zx’ expects argument of type ‘size_t’, but argument 4 has type ‘u32’ [-Wformat=]

We should use %x to print 'u32' values.

Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>