msm: mdss: read from HDMI CEC register only if CEC enabled
If HDMI CEC is not enabled and the CEC sysfs node is
written, an unclocked register access could occur. Access
this register only if CEC is enabled and configured.
Change-Id: I1a190a8302fdf7012723fb908c661098ebabead6
Signed-off-by:
Casey Piper <cpiper@codeaurora.org>
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