bootanimation: correct logo position and size after resolution changed

The resolution may be changed while the boot animation is playing.
mInitWidth and mInitHeight store the original resolution, and then the
animation coordinate and size are recalculated according to the ratio
(mWidth/mInitWidth and mHeight/mInitHeight).

Bug: 228605923
Test: change resolution and then reboot to check the animation
Change-Id: Id09490ecf7fc4b3e1a6baf073c134f357e9b327f