msm: vidc: Convert csc custom matrix enable bool to hfi mask

HFI expects enable/disable for each individual custom matrix.
When client enables custom matrix, the boolean values must
be converted to the mask value 0x7.

CRs-Fixed: 2141230
Change-Id: Id9badd9e678586c9461cc88bb3b94f9c4fff00dd
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>