We want to be able to use the utf16 functions that are currently present
in the EFI variables code in platform-specific code as well. Move them to
the kernel core, and in the process rename them to accurately describe what
they do - they don't handle UTF16, only UCS2.
Signed-off-by: NMatthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: NMatt Fleming <matt.fleming@intel.com>