UPSTREAM: PM: EM: Add missing newline for the message log

Fix missing newline for the string long in the error code path.

Reviewed-by: Hongyan Xia <hongyan.xia2@arm.com>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

(cherry picked from commit 4274521f)
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Change-Id: Ia3db2ec91c112d55d04c84e01201f517cf7838e6