msm: mdss: fb: add support for 64-bit arch

Port msm framebuffer driver to the 64-bit arch.
Modify qualifiers in prints and ensure
pointer casts are done in an appropriate manner for 64-bit.

Signed-off-by: Manoj Rao <manojraj@codeaurora.org>
Change-Id: I9379431d81f92da1e098ed09a7a3798bbaeee998