msm: vidc: Declare variable outside the loop

GCC does not allow variable declarations in for
loop initializers. The change fixes the same.

Change-Id: Idc1731448a246f0de7b11382105b86a06bb6eec9
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>