msm: mdss: hdmi: Add CEC interrupt bit macro

Use a macro for the interrupt bits and
use bitwise complement instead of logical
negation when disabling HDMI CEC interrupt.
Using logical negation will evaluate to 0
which will set the entire register value to
0 instead of just bits 1, 3, and 7.

Change-Id: Ia6b6a48500b4cc149c4f6b91859bdcc6882a7244
Signed-off-by: Casey Piper <cpiper@codeaurora.org>