feat(versal2): add support for AMD Versal Gen 2 platform

Introduce platform support for AMD Versal Gen 2.

Summary:
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Tests Skipped : 194
Tests Passed  : 29
Tests Failed  : 0
Tests Crashed : 0
Total tests   : 223
=================================
NOTICE:  Exiting tests.

Change-Id: I608dd556be402f97f9960c688b7d0caa6f17c5c3
Signed-off-by: Akshay Belsare <akshay.belsare@amd.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Maheedhar Bollapalli <maheedharsai.bollapalli@amd.com>
diff --git a/plat/xilinx/common/timer/timers.c b/plat/xilinx/common/timer/timers.c
index f53cd84..a6e1afa 100644
--- a/plat/xilinx/common/timer/timers.c
+++ b/plat/xilinx/common/timer/timers.c
@@ -27,6 +27,7 @@
 
 #define TTC_CNT_CNTRL_DISABLE_MASK	BIT(0)
 
+#define TTC_CLK_SEL_OFFSET		U(0x360)
 #define TTC_CLK_SEL_MASK		GENMASK(1, 0)
 
 #define TTC_CLK_SEL_PS_REF		BIT(0)