docs(versal): add ERRATA_ABI_SUPPORT build documentation

Add information about Versal platform for ERRATA_ABI_SUPPORT and
provide the build commands.

Signed-off-by: Prasad Kummari <prasad.kummari@amd.com>
Change-Id: I8466ea446814f888ae56f5cbb7bbdc06099d54f8
diff --git a/docs/plat/xilinx-versal.rst b/docs/plat/xilinx-versal.rst
index b71776d..e76b955 100644
--- a/docs/plat/xilinx-versal.rst
+++ b/docs/plat/xilinx-versal.rst
@@ -29,6 +29,11 @@
 make RESET_TO_BL31=1 CROSS_COMPILE=aarch64-none-elf- PLAT=versal bl31 VERSAL_CONSOLE=dcc
 ```
 
+To build TF-A with Errata management interface
+```bash
+make RESET_TO_BL31=1 CROSS_COMPILE=aarch64-none-elf- PLAT=versal bl31 ERRATA_ABI_SUPPORT=1
+```
+
 To build TF-A with Straight-Line Speculation(SLS)
 ```bash
 make RESET_TO_BL31=1 CROSS_COMPILE=aarch64-none-elf- PLAT=versal bl31 HARDEN_SLS_ALL=1