msm: vidc: Pre-allocate biggest internal buffers for secure

Avoid re-allocating internal buffers on resolution change for
secure. This will help reduce the time to get first FBD out
after resolution change.

CRs-Fixed: 972394
Change-Id: Idfb0fb862212ca1f9680fba5de3e66b08ba790df
Signed-off-by: Shalaj Jain <shalajj@codeaurora.org>