package/ffmpeg: re-enable for mips64r2 and mips64r6

ffmpeg 3 fixed support for mips64r2 and mips64r6, for details see
http://patchwork.ozlabs.org/patch/626756/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/ffmpeg/Config.in

@@ -1,8 +1,7 @@
 config BR2_PACKAGE_FFMPEG_ARCH_SUPPORTS
 	bool
 	# fenv.h lacks FE_INVALID, FE_OVERFLOW & FE_UNDERFLOW on nios2
-	# ffmpeg's configure script only supports mips64 (r1) variant
-	default y if !BR2_nios2 && !BR2_mips_64r2 && !BR2_mips_64r6
+	default y if !BR2_nios2
 
 menuconfig BR2_PACKAGE_FFMPEG
 	bool "ffmpeg"