msm:camera: fix vfe reset timeout

Meet vfe reset timeout error sometimes because of no IRQ given.
So need increase timeout duration, and also try to read the IRQ
status directly to check whether vfe reset has been finished or
not actually.

Change-Id: I739989855b71451223d25366d7f6de23ef105003
Signed-off-by: Fei Zhang <feizhang@codeaurora.org>