Platform: Copy crypto keys to eMRAM on Musca-S1

Copies the keys generated in the CC312 provisioning
process from the Musca-S1's volatile "OTP" area to the
on-board, non-volatile eMRAM. Adds a platform-dependent
define of the used flash address based on flash_layout.h.

Signed-off-by: Balint Matyi <Balint.Matyi@arm.com>
Change-Id: I220517c6d3aa4c4339a62825f13060f27246c6dd
diff --git a/platform/ext/musca_s1.cmake b/platform/ext/musca_s1.cmake
index 7d42196..c5c476d 100644
--- a/platform/ext/musca_s1.cmake
+++ b/platform/ext/musca_s1.cmake
@@ -190,6 +190,7 @@
     embedded_include_directories(PATH "${PLATFORM_DIR}/driver" ABSOLUTE)
 endif()
 
+#The CC312 is disabled by default
 if (NOT DEFINED CRYPTO_HW_ACCELERATOR)
     set (CRYPTO_HW_ACCELERATOR OFF)
 endif()