libpayload: UTF-16LE to ASCII conversion

This patch adds a simple function to convert a string in UTF-16LE
to ASCII.

TEST=Ran against a string found in a GPT with the intended outcome
BRANCH=none
BUG=none

Signed-off-by: Dan Ehrenberg <dehrenberg@chromium.org>
Change-Id: I50ca5bfdfbef9e084321b2beb1b8d4194ca5af9c
Reviewed-on: https://chromium-review.googlesource.com/231456
Reviewed-by: Julius Werner <jwerner@chromium.org>
2 files changed