Add exFAT support; unify behind "sdcard_type".

We're adding support for OEMs to ship exFAT, which behaves identical
to vfat.  Some rules have been manually enumerating labels related
to these "public" volumes, so unify them all behind "sdcard_type".

Test: atest
Bug: 67822822
Change-Id: I09157fd1fc666ec5d98082c6e2cefce7c8d3ae56
diff --git a/private/compat/27.0/27.0.ignore.cil b/private/compat/27.0/27.0.ignore.cil
index 493ac31..1eaf22a 100644
--- a/private/compat/27.0/27.0.ignore.cil
+++ b/private/compat/27.0/27.0.ignore.cil
@@ -15,6 +15,7 @@
     bpfloader_exec
     cgroup_bpf
     crossprofileapps_service
+    exfat
     exported2_config_prop
     exported2_default_prop
     exported2_radio_prop