UPSTREAM: lib: add some utf16 handling helpers

We'll eventually want these in a few places in efi_loader, and also
vsprintf.

Change-Id: I6c04463ad364e46730fcc84b86d38400f433e8de
Signed-off-by: Rob

UPSTREAM: lib: add some utf16 handling helpers

We'll eventually want these in a few places in efi_loader, and also
vsprintf.

Change-Id: I6c04463ad364e46730fcc84b86d38400f433e8de
Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
(cherry picked from commit 78178bb0c9dfe2a91a636a411291d8bab50e8a7d)

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