plat: xilinx: versal: Add support to get clock rate value

Add support to get clock's rate value.

Signed-off-by: Tejas Patel <tejas.patel@xilinx.com>
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Change-Id: I3ed881053ef323b2ca73e13edd0affda860d381d
diff --git a/plat/xilinx/versal/pm_service/pm_api_sys.h b/plat/xilinx/versal/pm_service/pm_api_sys.h
index a280b3e..72f0076 100644
--- a/plat/xilinx/versal/pm_service/pm_api_sys.h
+++ b/plat/xilinx/versal/pm_service/pm_api_sys.h
@@ -53,6 +53,7 @@
 enum pm_ret_status pm_clock_get_divider(uint32_t clk_id, uint32_t *divider);
 enum pm_ret_status pm_clock_set_parent(uint32_t clk_id, uint32_t parent);
 enum pm_ret_status pm_clock_get_parent(uint32_t clk_id, uint32_t *parent);
+enum pm_ret_status pm_clock_get_rate(uint32_t clk_id, uint32_t *clk_rate);
 enum pm_ret_status pm_pll_set_param(uint32_t clk_id, uint32_t param,
 				    uint32_t value);
 enum pm_ret_status pm_pll_get_param(uint32_t clk_id, uint32_t param,