cmake: Install the bl2's secure signing key

The secure key was not installed in case of
PLATFORM_DEFAULT_IMAGE_SIGNING because of
an unaligned endif() statement.

Change-Id: Id35cb029e4f3582adb5bff0ec6f2b7cfac7403c9
Signed-off-by: Bence Balogh <bence.balogh@arm.com>
1 file changed