Revert "core_base.mk: switch to new H264 and MPEG2 software codecs"

clang builds fail on the dependent libraries

This reverts commit c628500ca5cfd46152e238e9dc24217a3d08b906.

Change-Id: Ibd4cdce82b890bd3cb9d03a1a1bc0e4fc0e22ee8
diff --git a/target/product/core_base.mk b/target/product/core_base.mk
index 03d33e1..6c29482 100644
--- a/target/product/core_base.mk
+++ b/target/product/core_base.mk
@@ -41,14 +41,13 @@
     libstagefright_soft_amrdec \
     libstagefright_soft_amrnbenc \
     libstagefright_soft_amrwbenc \
-    libstagefright_soft_avcdec \
-    libstagefright_soft_avcenc \
     libstagefright_soft_flacenc \
     libstagefright_soft_g711dec \
     libstagefright_soft_gsmdec \
+    libstagefright_soft_h264dec \
+    libstagefright_soft_h264enc \
     libstagefright_soft_hevcdec \
     libstagefright_soft_mp3dec \
-    libstagefright_soft_mpeg2dec \
     libstagefright_soft_mpeg4dec \
     libstagefright_soft_mpeg4enc \
     libstagefright_soft_opusdec \