fixedfft: Only includes cpu-features.h when __arm__ is defined.

Change-Id: Ifb6c03b38eff3c94a507ceb5043fcc48b364c25c
diff --git a/media/libmedia/fixedfft.cpp b/media/libmedia/fixedfft.cpp
index 9cf05ba..2b495e6 100644
--- a/media/libmedia/fixedfft.cpp
+++ b/media/libmedia/fixedfft.cpp
@@ -26,7 +26,7 @@
 
 #include <stdio.h>
 #include <stdint.h>
-#ifdef __ARM_ARCH__
+#ifdef __arm__
 #include <machine/cpu-features.h>
 #endif