msm: mdss: Add PP compat ioctl framework and PCC compat ioctl

The MDP overlay compat layer now calls the PP compat ioctl. The only
PP feature supported in this patch is PCC. The PP compat ioctl handles
the copying of parameters from 32-bit to and from 64-bit structures, as
well as calling the FB ioctl.

The PP compat layer has one copy function per PP structure, in order to
simplify the adding of new fields to PP structures in the future.

Signed-off-by: Benet Clark <benetc@codeaurora.org>
Change-Id: Ibe4f15e1eab00fd4f26fdb2ac5505c2cbb0cbf58