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/versal/include/plat_private.h b/plat/xilinx/versal/include/plat_private.h
index 26545ba..a4210cd 100644
--- a/plat/xilinx/versal/include/plat_private.h
+++ b/plat/xilinx/versal/include/plat_private.h
@@ -20,7 +20,7 @@
 uint32_t get_uart_clk(void);
 void versal_config_setup(void);
 
-const mmap_region_t *plat_versal_get_mmap(void);
+const mmap_region_t *plat_get_mmap(void);
 
 extern uint32_t platform_id, platform_version;