refactor(xilinx): rename platform function to generic name

Refactor two platform specific functions, plat_versal_get_mmap() and
plat_versal_net_get_mmap(), to use a more generic function name
plat_get_mmap(). The function can be used in the common code to
obtain  memory region.

Change-Id: I3eeb24aff217eef30af60a7742cbebe9d3b2edce
Signed-off-by: Prasad Kummari <prasad.kummari@amd.com>
diff --git a/plat/xilinx/zynqmp/include/plat_private.h b/plat/xilinx/zynqmp/include/plat_private.h
index dda005a..afa102d 100644
--- a/plat/xilinx/zynqmp/include/plat_private.h
+++ b/plat/xilinx/zynqmp/include/plat_private.h
@@ -13,9 +13,12 @@
 #include <bl31/interrupt_mgmt.h>
 #include <common/bl_common.h>
 #include <drivers/cadence/cdns_uart.h>
+#include <lib/xlat_tables/xlat_tables.h>
 
 void zynqmp_config_setup(void);
 
+const mmap_region_t *plat_get_mmap(void);
+
 uint32_t zynqmp_calc_core_pos(u_register_t mpidr);
 
 /* ZynqMP specific functions */