RSS: Use dummy CC312 LCS

For temporary testing purposes, duplicate otp_cc312.c into the RSS
platform directory and change OTP reading and writing to instead read
and write a RAM variable. The CC312 will stay in CM state at all times,
but TF-M provisioning and boot stages will function correctly. Used to
fix an issue where the CC312 in FVP platforms doesn't respect system
resets triggering LCS transitions

Change-Id: Ib9d5a90220703c0e7f30f956994854af84fc9cc9
Signed-off-by: Raef Coles <raef.coles@arm.com>
2 files changed