armv8: fsl-layerscape: Add NXP LS2088A SoC support

The QorIQ LS2088A SoC is built on layerscape architecture.

It is similar to LS2080A SoC with some differences like
1)Timer controller offset is different
2)It has A72 cores
3)It supports TZASC module

Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/ls2080ardb/README b/board/freescale/ls2080ardb/README
index b1613ba..0c9c574 100644
--- a/board/freescale/ls2080ardb/README
+++ b/board/freescale/ls2080ardb/README
@@ -1,13 +1,13 @@
 Overview
 --------
 The LS2080A Reference Design (RDB) is a high-performance computing,
-evaluation, and development platform that supports the QorIQ LS2080A
+evaluation, and development platform that supports the QorIQ LS2080A, LS2088A
 Layerscape Architecture processor.
 
-LS2080A SoC Overview
+LS2080A, LS2088A SoC Overview
 --------------------
-Please refer arch/arm/cpu/armv8/fsl-layerscape/doc/README.soc for LS2080A
-SoC overview.
+Please refer arch/arm/cpu/armv8/fsl-layerscape/doc/README.soc for LS2080A,
+LS2088A SoC overview.
 
  LS2080ARDB board Overview
  -----------------------