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/26.0/26.0.ignore.cil b/private/compat/26.0/26.0.ignore.cil
index 71c7a00..bc847ee 100644
--- a/private/compat/26.0/26.0.ignore.cil
+++ b/private/compat/26.0/26.0.ignore.cil
@@ -18,6 +18,7 @@
     crossprofileapps_service
     e2fs
     e2fs_exec
+    exfat
     exported_bluetooth_prop
     exported_config_prop
     exported_dalvik_prop