xilinx: Consolidate board_fit_config_name_match() for Xilinx platforms

Move board_fit_config_name_match() from Zynq/ZynqMP to common location.
This change will open a way to use it also by Microblaze and Versal.
Through this function there is a way to handle images with multiple DTBs.
For now match it with DEVICE_TREE as is done for Zynq.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

board/xilinx/common/board.c

@@ -16,6 +16,7 @@
 #include <dm.h>
 #include <i2c_eeprom.h>
 #include <net.h>
+#include <generated/dt.h>
 
 #include "fru.h"
 
@@ -425,3 +426,13 @@ int board_late_init_xilinx(void)
 	return 0;
 }
 #endif
+
+int __maybe_unused board_fit_config_name_match(const char *name)
+{
+	debug("%s: Check %s, default %s\n", __func__, name, DEVICE_TREE);
+
+	if (!strcmp(name, DEVICE_TREE))
+		return 0;
+
+	return -1;
+}