actions: add label for MIPS architecture area

Add automatic labeling of the MIPS arch area.

Signed-off-by: Antony Pavlov <[email protected]>

Author: frantony

.github/labeler.yml

@@ -60,6 +60,9 @@
 "area: ARM64":
   - "arch/arm64/**/*"
   - "include/arch/arm64/**/*"
+"area: MIPS":
+  - "arch/mips/**/*"
+  - "include/arch/mips/**/*"
 "area: NIOS2":
   - "arch/nios2/**/*"
   - "include/arch/nios2/**/*"