msm: sps: Fix incompatible type assignment

The virt_addr in struct sps_bam_props is the virtual address
corresponding to ioremap memory. Hence, it must be of
type void __iomem *virt_addr. Change type of virtual
address in all required places.

Change-Id: I73e33e50e86a9b3f98a6e422b8561dae0e8a1e1e
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>