Use av1_inverse_transform_block() in rdopt.c
Use av1_inverse_transform_block() in rdopt.c

This will make the code cleaner

Change-Id: I94622b696b0a8d51d28dbbe29c767a62942bc5f3

GrokImageCompression/aom,smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,smarter/aom,smarter/aom,smarter/aom,GrokImageCompression/aom