drm/msm/sde: Fix 32-bit compilation issues

Fix 32 bit compilation issues in display DRM driver.

1) Fix issues of casting integer to pointer of incompatible type.
   (Used uintptr_t and u64_to_userptr)

2) Fix stack frame overflow in DP driver.
   (Reduce size of variables allocated on stack)

3) Fix Incorrect type used for printing size_t and unsigned long

4) Fix issues with mult_frac and roundup macro due to u64 division.

5) Rework histogram data in PP driver to fix stack frame overflow

Change-Id: Id28f8025f0d2ac49ef3ce3f4a9ba11dff03da0ea
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>
Signed-off-by: Ch Ganesh Kumar <chganesh@codeaurora.org>
Signed-off-by: Shubhashree Dhar <dhar@codeaurora.org>