Remove unnecessary neon flags and update a missing comment.

-mfpu=neon collides when we have improved flags like -mfpu=neon-vfpv4
(that can be used with krait CPUs).

The prior -no-integrated-as change (which exposes this bug) was also
missing a BUG: link in the Android.mk itself.

Change-Id: I808144d4560ca579749af2aa1372f3d599890308

src/modules/audio_processing/aecm/Android.mk

@@ -67,13 +67,12 @@ LOCAL_MODULE_TAGS := optional
 
 LOCAL_SRC_FILES := aecm_core_neon.c
 # Assembly code in aecm_core_neon.c does not compile with Clang.
+# BUG: 17820427
 LOCAL_CLANG_CFLAGS_arm += -no-integrated-as
 
 # Flags passed to both C and C++ files.
 LOCAL_CFLAGS := \
     $(MY_WEBRTC_COMMON_DEFS) \
-    -mfpu=neon \
-    -mfloat-abi=softfp \
     -flax-vector-conversions
 
 LOCAL_MODULE_TARGET_ARCH := arm

src/modules/audio_processing/ns/Android.mk

@@ -72,8 +72,6 @@ LOCAL_SRC_FILES := nsx_core_neon.c
 # Flags passed to both C and C++ files.
 LOCAL_CFLAGS := \
     $(MY_WEBRTC_COMMON_DEFS) \
-    -mfpu=neon \
-    -mfloat-abi=softfp \
     -flax-vector-conversions
 
 LOCAL_MODULE_TARGET_ARCH := arm