msm: mdss: add timeout when waiting for vsync
msm: mdss: add timeout when waiting for vsync

To avoid any possible freezes while waiting for vsync, add a timeout
while waiting for vsync interrupt and report a visible warning.

CRs-Fixed: 428821
Change-Id: I328ac05b98741fc77eb424c313a3b3afb3e206d2
Signed-off-by: Adrian Salido-Moreno <f4561ccbe90a02dadc9d168b29bfea0c1b57222c@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas