disp: msm: dp: avoid register access when lclk is off

Sometimes the link clock is not getting locked when dp
display is resumed from PM suspend. This is causing NOC
error when registers in link clock domain are accessed
without proper checks.

The set_colorspace, config_hdr and update_pps connector
ops are accessing the registers in link clock domain
without checking if the necessary clocks are enabled.
These changes will ensure the DP stream clocks are not
enabled when link clock enable fails and prevents the
connector ops from accessing the registers whose clocks
are not enabled.

Change-Id: If89d2552ee0ce96493ee8c1666d7677221705d9a
Signed-off-by: Sankeerth Billakanti <sbillaka@codeaurora.org>