Implement support for parsing/interacting with NCAs. (#942)

* fs: implement support for interacting with ncas.

* spl: extend to use virtual keyslots

libraries/libstratosphere/include/stratosphere/fs/fs_query_range.hpp

@@ -47,6 +47,8 @@ namespace ams::fs {
 
     enum class AesCtrKeyTypeFlag : s32 {
         InternalKeyForSoftwareAes = (1 << 0),
+        InternalKeyForHardwareAes = (1 << 1),
+        ExternalKeyForHardwareAes = (1 << 2),
     };
 
 }