msm: mdss: Add overlay PP param copy functions to overlay compat

The overlay compat ioctl requires the copying of some PP parameters found
in the overlay_pp_params structure. This change also adds the copy
functions for histogram and sharp compat structures that are needed.

Signed-off-by: Benet Clark <benetc@codeaurora.org>
Change-Id: Ifc1681034cc68e45b35fd391d1b529b6b0436516