drivers: mfd: Cleanup of wcd drivers

Kernel has defined printk format specifiers and typedefs
for datatypes.
Using the format strings will remove need for typecasting.
This change cleans up wcd msm drivers to use the kernel
defined data types and format specifiers for printk.

Change-Id: I9f451d0fc5eb15a93a51b6ffe647b6990c9e9dc1
Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>