msm: camera: Changes to accommodate 32-bit Arch

This driver is using uint64_t to store pointers. On 64 bit uint64_t
and pointer is of the same size, but on the 32 bit system pointers are
smaller. Casting uint64_t to pointer generates warning on 32 bit
platforms.
Fix this by storing pointers as uintptr_t.

On a 32 bit system, pointer size is 32 bits, but userspace is passing
uint64_t value. Casting uint64_t to pointer generates a compilation
warning.
Fix this by first casting uint64_t to uintptr_t then to void ptr.

Change-Id: I4e518288c2835a074e0dfb2dc2c1d1c6e9de55c0
Signed-off-by: Trishansh Bhardwaj <tbhardwa@codeaurora.org>
Signed-off-by: Sridhar Gujje <sgujje@codeaurora.org>