RAS: Add fault injection support

The ARMv8.4 RAS extensions introduce architectural support for software
to inject faults into the system in order to test fault-handling
software. This patch introduces the build option FAULT_HANDLING_SUPPORT
to allow for lower ELs to use registers in the Standard Error Record to
inject fault. The build option RAS_EXTENSIONS must also be enabled along
with fault injection.

This feature is intended for testing purposes only, and is advisable to
keep disabled for production images.

Change-Id: I6f7a4454b15aec098f9505a10eb188c2f928f7ea
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
diff --git a/docs/user-guide.rst b/docs/user-guide.rst
index 880fe7d..a1719ef 100644
--- a/docs/user-guide.rst
+++ b/docs/user-guide.rst
@@ -390,6 +390,14 @@
    handled at EL3, and a panic will result. This is supported only for AArch64
    builds.
 
+-  ``FAULT_INJECTION_SUPPORT``: ARMv8.4 externsions introduced support for fault
+   injection from lower ELs, and this build option enables lower ELs to use
+   Error Records accessed via System Registers to inject faults. This is
+   applicable only to AArch64 builds.
+
+   This feature is intended for testing purposes only, and is advisable to keep
+   disabled for production images.
+
 -  ``FIP_NAME``: This is an optional build option which specifies the FIP
    filename for the ``fip`` target. Default is ``fip.bin``.