fix(cpus): workaround for Cortex-A715 erratum 2344187

Cortex-A715 erratum 2344187 is a Cat B erratum that applies to r0p0,
r1p0 and is fixed in r1p1. The workaround is to set GCR_EL1.RRND to
0b1, and apply an implementation specific patch sequence.

SDEN: https://developer.arm.com/documentation/SDEN2148827/latest

Change-Id: I78ea39a91254765c964bff89f771af33b23f29c1
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 6f5f01f..07caee7 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -885,6 +885,10 @@
    Cortex-A715 CPU. This needs to be enabled for revisions r0p0 and r1p0.
    It is fixed in r1p1.
 
+- ``ERRATA_A715_2344187``: This applies errata 2344187 workaround to
+   Cortex-A715 CPU. This needs to be enabled for revisions r0p0 and r1p0. It is
+   fixed in r1p1.
+
 -  ``ERRATA_A715_2420947``: This applies errata 2420947 workaround to
    Cortex-A715 CPU. This needs to be enabled only for revision r1p0.
    It is fixed in r1p1.