util: Correct typo in MSR_EBC_SOFT_POWERON

Change-Id: Iba5fc92d8740d0bb7d41f8a83513ba7fb97be592
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/15900
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2 files changed