msm: mdss: copy gamut conf tables from kernel mem

Read the gamut config data from hardware into kernel's
memory and copy back to user space address using copy_to_user
API. This prevents MDP PP driver from writing directly into
userspace virtual address to copy gamut config data.

CRs-Fixed: 516720
Change-Id: Ib1f53e949696f7d4a45410c529fe9375c502090f
Signed-off-by: Manoj Rao <manojraj@codeaurora.org>