Bootanimation: Fix the low memory device oom when run boot animation

Low memory device is easily to be oom when run boot animation, like
8x10 SKUAA. Here we do optimize the boot animation GL Texture only
one frame needed. That is free timely and re-init it again. When in
boot animation, the fps=15, so it is ok to do the delete and re-init.

CRs-Fixed: 572325
Change-Id: I1e81c3d0f3600ac895f9bd7bd00a284f3d4b7d4c