Platform: Get LCS manually on Musca-S1 based on eMRAM

Gets the security life-cycle state based on the contents
of the persistent eMRAM on the Musca-S1, instead of the
volatile OTP.

Signed-off-by: Balint Matyi <Balint.Matyi@arm.com>
Change-Id: I43b31af8d9af26fcb2db42183ac6af291fe10ab8