binman: Drop use of tools.FromUnicode()

This function has been removed now that everything is migrated to
Python 3. Drop it.

BUG=b:190384016, b:190560337
TEST='binman test'
run through CQ

Signed-off-by: Simon Glass <sjg@chromium.org>
Change-Id: If655787170e40886ccef60362b4192eb36a97531
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/u-boot/+/2949651
Reviewed-by: Denis Brockus <dbrockus@chromium.org>
1 file changed