fix(xilinx): fix comment about MEM_BASE/SIZE

Comment is not showing correct macro name that's why fix it.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Change-Id: I8bc38534309285af8a27ee43782e03e9d0470267
diff --git a/plat/amd/versal2/platform.mk b/plat/amd/versal2/platform.mk
index 1c977a3..3892fcb 100644
--- a/plat/amd/versal2/platform.mk
+++ b/plat/amd/versal2/platform.mk
@@ -32,7 +32,7 @@
     $(eval $(call add_define,MEM_BASE))
 
     ifndef MEM_SIZE
-        $(error "ATF_BASE defined without ATF_SIZE")
+        $(error "MEM_BASE defined without MEM_SIZE")
     endif
     $(eval $(call add_define,MEM_SIZE))
 
@@ -45,7 +45,7 @@
     $(eval $(call add_define,BL32_MEM_BASE))
 
     ifndef BL32_MEM_SIZE
-        $(error "BL32_BASE defined without BL32_SIZE")
+        $(error "BL32_MEM_BASE defined without BL32_MEM_SIZE")
     endif
     $(eval $(call add_define,BL32_MEM_SIZE))
 endif