OvmfPkg: Install LockBox protocol in constructor of LockBoxDxeLib

OvmfPkg: Install LockBox protocol in constructor of LockBoxDxeLib

Currently, the LockBox protocol is installed in entrypoint of
OVMF AcpiS3SaveDxe.

We can let the first driver run with LockBoxDxeLib linked to have its
library constructor to install LockBox protocol on the ImageHandle.
As other drivers may have gEfiLockBoxProtocolGuid dependency,
the first driver should run before them.

The later patches to retire AcpiS3SaveDxe for OVMF depends on this patch.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>