aom_configure: ensure RTCD_CONFIG_* are properly set
aom_configure: ensure RTCD_CONFIG_* are properly set

adjustments made by aom_configure.cmake need to be done prior to
including cpu.cmake

Change-Id: I482905414da4b1e112066d127cd71f8eae9dd504

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