CC312: Fork CC312 runtime library inside tf-m

Files from https://github.com/ARM-software/cryptocell-312-runtime, on
commit a31f19d6fa2173c53f5181a90af100866a78c314

Change-Id: Idd00e58a5bb694de978207823e7553ec051a67ed
Signed-off-by: Raef Coles <raef.coles@arm.com>
diff --git a/lib/ext/cryptocell-312-runtime/build.props b/lib/ext/cryptocell-312-runtime/build.props
new file mode 100644
index 0000000..7950056
--- /dev/null
+++ b/lib/ext/cryptocell-312-runtime/build.props
@@ -0,0 +1,7 @@
+PROJ_NAME = cc312
+PROJ_VER = 1.3.0
+BUILD_MACHINE = Linux 4.4.0-127-generic x86_64
+BUILD_TIME = Mon Jul 8 09:23:14 UTC 2019
+TARGET_HOST_ARCH = arm
+GIT_BRANCH = refs/tags/cc312r1-1.3.0-rel-rc10-20190708-1221
+GIT_REV = 6227ff8