aom_dsp.mk: Remove redundant CONFIG_PVQ section.
aom_dsp.mk: Remove redundant CONFIG_PVQ section.

Same sources as CONFIG_AV1 section. Combined them, and fixed
a comment.

Change-Id: I5273849143c0c92a506deeb9241a761e5ee125d3

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