Bug 963621 - Stop passing kClientNeedsFramebuffer into Qualcomm OMXCodec. r=doublec, a=lsblakk

Qualcomm's OMXCodec implementation interprets the kClientNeedsFramebuffer flag
to mean that we only want a thumbnail. Thus, it returns only one frame and then
returns EOS.

This patch adds a Qualcomm-specific hack to not pass their decoder this flag.