Implement mfic and mtic

Both were no-ops, so mfic left its destination unchanged. They read and
write the interrupt enable flag that sceKernelCpuSuspendIntr/ResumeIntr
use. Only bit 0 counts for mtic, which also goes for
sceKernelCpuResumeIntr, since on hardware it's just mtic.

Adds the intr/mfic test, recorded on hardware.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

test.py

@@ -262,6 +262,7 @@ tests_good = [
   "hash/sha1ctx",
   "hle/check_not_used_uids",
   "intr/intr",
+  "intr/mfic",
   "intr/enablesub",
   "intr/suspended",
   "intr/vblank/vblank",