msm: vidc: Try venus PC 10 times before quiting

Certain video test cases fail because driver raises
a sys error after trying unsuccessfully to put firmware
into power collapse 4 times. Increase the upper limit to 10,
to ensure that tne driver gives firmware enough time to go
into power collapse before raising an error.

Change-Id: I7b876f444941bc5c91fc7da392c4d5acf0256a69
Signed-off-by: Arun Menon <avmenon@codeaurora.org>