When the script was pulled out of the makefile, it was left as it was
written in the makefile to show the continuity with the original. This
patch cleans up issues identified by shellcheck and adds comments.
Change-Id: I5e6573a4fdfbb397e15db38e2e3dfadeb3430573
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: http://review.coreboot.org/11931
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
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