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/bl31_versal_setup.c b/plat/xilinx/versal/bl31_versal_setup.c
index 48f774d..ee45f4e 100644
--- a/plat/xilinx/versal/bl31_versal_setup.c
+++ b/plat/xilinx/versal/bl31_versal_setup.c
@@ -218,6 +218,6 @@
 		{0}
 	};
 
-	setup_page_tables(bl_regions, plat_versal_get_mmap());
+	setup_page_tables(bl_regions, plat_get_mmap());
 	enable_mmu(0);
 }