msm: vidc: Compilation workaround for Sourcery-G++ compiler

The Sourcery-G++ compiler seems to have trouble initialising
members of anonymous unions. Just drop the initialisation of val
altogether to work around the compilation error, as val is always set
before being used.

Change-Id: Ia87f0451acd277a148f88d007abcfbe4d8c0ab87
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>