cmake: add missing CONFIG_DPCM_INTRA

Change-Id: I0a244e3c2a8730febeede1f7f17c25978b3f4930
diff --git a/build/cmake/aom_config_defaults.cmake b/build/cmake/aom_config_defaults.cmake
index ce32560..d03bc5e 100644
--- a/build/cmake/aom_config_defaults.cmake
+++ b/build/cmake/aom_config_defaults.cmake
@@ -164,3 +164,4 @@
 set(CONFIG_LOWDELAY_COMPOUND 0 CACHE BOOL "Internal flag.")
 set(CONFIG_SMOOTH_HV 0 CACHE BOOL "Internal flag.")
 set(CONFIG_ANALYZER 0 CACHE BOOL "Internal flag.")
+set(CONFIG_DPCM_INTRA 0 CACHE BOOL "Internal flag.")