msm: vidc: Fix for fuzz issues in firmware

Firmware is reporting session error for etb/ftb
due to incorrect packet sizes being sent. Fix this
by modifying the size of zero lenth array elements
in etb/ftb packets to one.

Change-Id: I2127290b9bd7f62e524d19f2fee42691d26e6d0a
Signed-off-by: Rajeshwar Kurapaty <rkurapat@codeaurora.org>