msm: mdss: Remove support for CSC_0 hardware

The Color Space Conversion hardware is only instantiated once as
CSC_1. There is no CSC_0 hardware in the MDSS. Remove any mention of CSC_0
in order to be clear.

Change-Id: Ie7f8ef4dbb6e5f6ba1550020938dc101fec64800
Signed-off-by: Benet Clark <benetc@codeaurora.org>