SDEI: Fix build error with logging enabled
SDEI: Fix build error with logging enabled

Change-Id: Iee617a3528225349b6eede2f8abb26da96640678
Signed-off-by: Jeenu Viswambharan <5b289de972918ffd274229d00560f010009baf9e@arm.com>

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