msm: vidc: Fixes polling on video driver.
msm: vidc: Fixes polling on video driver.

poll should return all the available events
in one call. This change implements this
behavior.

Change-Id: I498b621cc5d8fca820376109ca4a5f1bd4c492b2
Signed-off-by: Vinay Kalia <05243070b7fcb94c08882b4f3952a1c5d61493b2@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