Mandate 'Signed-off-by' line in commit messages
Mandate 'Signed-off-by' line in commit messages

This patch updates the configuration file for the checkpatch.pl
script to check for the presence of a 'Signed-off-by' line in the
commit message. This is now required by TF contribution process.

Change-Id: I8bcd6d39a5dcd85547244d60c10a7cd2148c404f

Signed-off-by: Sandrine Bailleux <4b69fcfca8da45b0c11ecda5434c5da526575d9d@arm.com>

sbranden/arm-trusted-firmware,lsigithub/arm-trusted-firmware_public,achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware,lsigithub/arm-trusted-firmware_public,sbranden/arm-trusted-firmware