tests/tcg: enable building for AArch64

We only have compilers for the (default) little endian variants.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index a6d233a..de1ae84 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -136,6 +136,7 @@
 S: Maintained
 F: target/arm/
 F: tests/tcg/arm/
+F: tests/tcg/aarch64/
 F: hw/arm/
 F: hw/cpu/a*mpcore.c
 F: include/hw/cpu/a*mpcore.h