Enable SSE optimized IDCT in jpeg decoding for x86 platform.

Change-Id: I9a646a0ca208e9ad1a11929f3fd71b7d19592dd9
Signed-off-by: Xun Sun <xun.sun@intel.com>
diff --git a/Android.mk b/Android.mk
index 6e78c74..b5905d1 100644
--- a/Android.mk
+++ b/Android.mk
@@ -35,7 +35,7 @@
 # enable tile based decode
 LOCAL_CFLAGS += -DANDROID_TILE_BASED_DECODE
 
-ifeq ($(TARGET_ARCH_VARIANT),x86-atom)
+ifeq ($(TARGET_ARCH),x86)
   LOCAL_CFLAGS += -DANDROID_INTELSSE2_IDCT
   LOCAL_SRC_FILES += jidctintelsse.c
 endif