nvramcui: refactor code

Split the main() into a couple of smaller functions in order to more
easily extend the payload.

Change-Id: I4c2b144e2a28c6f15e360d55c49974675e6a80d2
Signed-off-by: Antonello Dettori <dev@dettori.io>
Reviewed-on: https://review.coreboot.org/16248
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
1 file changed