1. Fixes logic for disabling global motion w/ resize. Turns off
conditional write/read of global parameters since it does not
work currenlty. To be fixed later.
2. Fixes call for av1_scale_if_required in encoder_frame_with_resize
function
3. Remove asserts for the scaled convolve functions

Change-Id: I6a0f18b5ab5cc819bc27ef9fc2f28b0e391643a0