SDEI: Fix locking issues

The event lock for a shared event was being unlocked twice, and the
locking sequence for event complete was misplaced. This patch fixes both
issues.

Change-Id: Ie2fb15c6ec240af132d7d438946ca160bd5c63dc
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
1 file changed