drm/msm/dp: check for aborted flag before controller power on

In case the abort flag has been set, do not proceed with controller
power on. Abort flag could mean that host has been de-initialized.
Powering controller in that condition could result in unstable system.
Avoid this by taking no action if abort flag has been set and return
with proper error code.

CRs-Fixed: 2338231
Change-Id: I95438e43060decb256039555957eb54f08edbc3d
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>