fix(cpus): fix the rev-var of Cortex-X2

Update the revision and variant information in the
errata ABI file, cortex_X2.S file for erratum ID - 2058056
to match the revision and variant in the latest SDEN.

SDEN documentation:
https://developer.arm.com/documentation/SDEN-1775100/latest

Change-Id: I28ee39949d977c53d6f5243100f0c29bc3c0428c
Signed-off-by: Sona Mathew <sonarebecca.mathew@arm.com>
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 82212f9..019924f 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -690,7 +690,7 @@
 CPU_FLAG_LIST += ERRATA_X2_2002765
 
 # Flag to apply erratum 2058056 workaround during reset. This erratum applies
-# to revisions r0p0, r1p0, and r2p0 of the Cortex-X2 cpu and is still open.
+# to revisions r0p0, r1p0, r2p0 and r2p1 of the Cortex-X2 cpu and is still open.
 CPU_FLAG_LIST += ERRATA_X2_2058056
 
 # Flag to apply erratum 2083908 workaround during reset. This erratum applies