.clang-format: allow packing of initializer lists
.clang-format: allow packing of initializer lists

Change-Id: Iffe907de3a4db519b50f3855c121c8f6d26db450

luctrudeau/aom,luctrudeau/aom,mbebenita/aom,shacklettbp/aom,jmvalin/aom,GrokImageCompression/aom,thdav/aom,GrokImageCompression/aom,smarter/aom,mbebenita/aom,jmvalin/aom,thdav/aom,thdav/aom,shacklettbp/aom,mbebenita/aom,GrokImageCompression/aom,mbebenita/aom,smarter/aom,jmvalin/aom,smarter/aom,thdav/aom,smarter/aom,mbebenita/aom,mbebenita/aom,shacklettbp/aom,jmvalin/aom,luctrudeau/aom,smarter/aom,mbebenita/aom,GrokImageCompression/aom,jmvalin/aom,luctrudeau/aom,mbebenita/aom,thdav/aom,smarter/aom,jmvalin/aom,luctrudeau/aom,GrokImageCompression/aom,shacklettbp/aom,luctrudeau/aom,mbebenita/aom,shacklettbp/aom,GrokImageCompression/aom,thdav/aom,shacklettbp/aom