Revert "Fix compiling error in vp9_idct.h"

This reverts commit eafc8c9c40d712aabe234bed5269a02c62fa0bfc.

tran_low_t/tran_high_t don't belong in a public header, they're private.
Similarly the public headers shouldn't rely on config defines,
vpx_config.h isn't installed.

Change-Id: I194ec273598da418df8dd727b6c0e78a556740ad
4 files changed