Remove duplicate or unused code in encoder/encodemb.c.
Also make some minor stylistic changes to bring the code closer to the style guide. Remove distinction between inter and intra transform functions, since both do exactly the same thing except for the check against SPLITMV for the second-order transform. Remove some commented out debug code. Remove 8x8/16x16 transform code in encode_inter16x16y(), since the first-pass only uses 4x4 anyway. Change-Id: Ife54816ff759825b9141f95dc2ba43c253c14dba