feat(cpus): workaround for Cortex-A520(2938996) and Cortex-X4(2726228)

This patch implements errata functions for two errata, both of them
disable TRBE as a workaround. This patch doesn't have functions
that disable TRBE but only implemented helper functions that are
used to detect cores affected by Errata 2938996(Cortex-A520) & 2726228(Cortex-X4)

Cortex-X4 SDEN documentation:
    https://developer.arm.com/documentation/SDEN2432808/latest

Cortex-A520 SDEN Documentation:
    https://developer.arm.com/documentation/SDEN-2444153/latest

Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: I8f886a1c21698f546a0996c719cc27dc0a23633a
(cherry picked from commit 4a97ff5111204a18b4f72d1e1cd3d8285f16289d)
diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 004e733..05d20d9 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -822,6 +822,10 @@
   feature is enabled and can assist the Kernel in the process of
   mitigation of the erratum.
 
+- ``ERRATA_X4_2726228``: This applies erratum 2726228 workaround to Cortex-X4
+  CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in
+  r0p2.
+
 -  ``ERRATA_X4_2740089``: This applies errata 2740089 workaround to Cortex-X4
    CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed
    in r0p2.
@@ -895,6 +899,10 @@
    Cortex-A520 CPU. This needs to be enabled for revisions r0p0 and r0p1.
    It is still open.
 
+-  ``ERRATA_A520_2938996``: This applies errata 2938996 workaround to
+   Cortex-A520 CPU. This needs to be enabled for revisions r0p0 and r0p1.
+   It is fixed in r0p2.
+
 For Cortex-A715, the following errata build flags are defined :
 
 -  ``ERRATA_A715_2331818``: This applies errata 2331818 workaround to