package/fdk-aac: enable on s390x

s390x is supported since bump to version 2.0.3 in commit
38a20a0998117f3debb4de06e209ba5d82bb7a9d and
https://github.com/mstorsjo/fdk-aac/commit/c16d5d72c99a77c8bcb788a922323b0b59035803

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

package/fdk-aac/Config.in

@@ -7,6 +7,7 @@ config BR2_PACKAGE_FDK_AAC_ARCH_SUPPORTS
 	default y if BR2_mips || BR2_mipsel || BR2_mips64 || BR2_mips64el
 	default y if BR2_powerpc
 	default y if BR2_sh
+	default y if BR2_s390x
 
 config BR2_PACKAGE_FDK_AAC
 	bool "fdk-aac"