board: ti: am62ax: Set fdtfile from C code instead of findfdt script

Stop using the findfdt script and switch to setting the fdtfile from
C code.

While at this, replace findfdt in environment with a warning as it is
no longer needed

Reviewed-by: Jonathan Humphreys <j-humphreys@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: Nishanth Menon <nm@ti.com>

board/ti/am62ax/am62ax.env

@@ -1,5 +1,4 @@
 #include <env/ti/ti_common.env>
-#include <env/ti/default_findfdt.env>
 #include <env/ti/mmc.env>
 
 name_kern=Image

board/ti/am62ax/evm.c

@@ -13,6 +13,8 @@
 #include <fdt_support.h>
 #include <spl.h>
 
+#include "../common/fdt_ops.h"
+
 int board_init(void)
 {
 	return 0;
@@ -27,3 +29,11 @@ int dram_init_banksize(void)
 {
 	return fdtdec_setup_memory_banksize();
 }
+
+#ifdef CONFIG_BOARD_LATE_INIT
+int board_late_init(void)
+{
+	ti_set_fdt_env(NULL, NULL);
+	return 0;
+}
+#endif

configs/am62ax_evm_a53_defconfig

@@ -24,6 +24,7 @@ CONFIG_SPL_LOAD_FIT_ADDRESS=0x81000000
 CONFIG_BOOTSTD_FULL=y
 CONFIG_BOOTSTD_DEFAULTS=y
 CONFIG_BOOTCOMMAND="run envboot; bootflow scan -lb"
+CONFIG_BOARD_LATE_INIT=y
 CONFIG_SPL_MAX_SIZE=0x58000
 CONFIG_SPL_PAD_TO=0x0
 CONFIG_SPL_HAS_BSS_LINKER_SECTION=y