msm: vdec: Allocate max internal buffers

During port reconfiguration, reallocating internal
buffers adds to the reconfiguration delay. This change
ensures that maximum supported size of internal
buffers are allocated to avoid reallocation during
port reconfiguration.
Remove the RECONFIG_HINT command as userspace client
does not use this command.

CRs-Fixed: 2071064
Change-Id: I66b5b472f08b9264841dae4f2339f85e3ba879ff
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>