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Complete the missing part of "checking (and disabling) write protection status.
This also helps to prevent erasing RW regions on system with WP enabled and
then causing boot failure.
BUG=chrome-os-partner:1276
TEST=(1) On CR-48 with WP enabled, run make_dev_firmware.sh without turning off WP.
Result: Error message "Write protection is still enabled. Please verify
that hardware write protection is disabled." (as expected)
(2) Disable WP and run again.
Result: firmware has been changed successfully.
Change-Id: Iaf2243cb2cd3c7f83ce4f36543ea3da1e3ca55a1
Review URL: http://codereview.chromium.org/5987010