tests/tcg: Add microblaze to arches filter

Not attempting to use a single cross-compiler for both
big-endian and little-endian at this time.

Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tests/tcg/configure.sh

@@ -94,7 +94,7 @@ for target in $target_list; do
     xtensa|xtensaeb)
       arches=xtensa
       ;;
-    alpha|cris|hppa|i386|lm32|m68k|openrisc|riscv64|s390x|sh4|sparc64)
+    alpha|cris|hppa|i386|lm32|microblaze|microblazeel|m68k|openrisc|riscv64|s390x|sh4|sparc64)
       arches=$target
       ;;
     *)