BACKPORT: crossystem: arm: fix incorrect mainfw_act output

BUG=chromium-os:15626
TEST=manual

when not recovery boot
$ [ $(crossystem mainfw_act) = "A" ] || [ $(crossystem mainfw_act) = "B" ]

when recovery boot
$ [ $(crossystem mainfw_act) = "recovery" ]

Change-Id: I28ef84380322a292faea8bebbbc00516238075a7
Reviewed-on: http://gerrit.chromium.org/gerrit/1345
Tested-by: Che-Liang Chiou <clchiou@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: http://gerrit.chromium.org/gerrit/1348
Reviewed-by: Che-Liang Chiou <clchiou@chromium.org>
1 file changed