msm: mdss: Copy IGC LUT data correctly to userspace

During IGC read operation, IGC LUT's data was copied to
userspace incorrectly because of swapping color components.

Fix component data swapping during IGC LUT data copy to
user space to provide the correct IGC LUT data to user space.

Change-Id: I301a3500f0e0c4bbf9f52affa66373585c72d987
Signed-off-by: Krishna Chaitanya Parimi <cparimi@codeaurora.org>
msm: mdss: update layer mixer access for calibration tool

Calibration tool should have register access on all layer
mixers connected to DSPP pipe and WB path. It should
also have control layer register access to read
the current layer mixer configuration.

Change-Id: If2cc86c2e6f470e090746a400b16cb540948c3e9
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>