msm: kgsl: Use CP_WIDE_REG_WRITE to write to content protection registers

Content protection registers are at dword offsets > 0x7fff, so these
registers should be written using CP packet CP_WIDE_REG_WRITE.

Change-Id: Ib439bb5cd815cbcf50cb42fc4a2bef3fec6c60bb
Signed-off-by: Tarun Karra <tkarra@codeaurora.org>