mkefidisk.sh: Improve logging

mkefidisk.sh: Improve logging

Add logging functions: error, warn, info, and success, using tput to add
color highlighting.

Use these routines throughout the script, replacing echo statements and
adding "|| error" in several places to eliminate silent failures. Add a
simple exit block which checks for issues encountered while running.

(From OE-Core rev: b5a3f6465a7fd8e821b81da053bf7e11535f1652)

Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>