fix(cpus): workaround for Neoverse V2 erratum 2801372

Neoverse V2 erratum 2801372 is a Cat B erratum that applies to
all revisions <=r0p1 and is fixed in r0p2. The workaround is to
insert a dsb before the isb in the power down sequence.

This errata is explained in SDEN 2332927 available at:
https://developer.arm.com/documentation/SDEN2332927

Change-Id: I8716b9785a67270a72ae329dc49a2f2239dfabff
Signed-off-by: Moritz Fischer <moritzf@google.com>
(cherry picked from commit 40c81ed5335191fbe32466e56aa4fb6db1da466c)
diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 758d62b..6f97528 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -527,6 +527,10 @@
    IP. This needs to be enabled for revisions r0p0 and r0p1. It has been fixed
    in r0p2.
 
+-  ``ERRATA_V2_2801372``: This applies errata 2801372 workaround to Neoverse-V2
+   CPU, this affects all configurations. This needs to be enabled for revisions
+   r0p0 and r0p1. It has been fixed in r0p2.
+
 For Cortex-A710, the following errata build flags are defined :
 
 -  ``ERRATA_A710_1987031``: This applies errata 1987031 workaround to