board: ti: am62x: 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/am62x/am62x.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/am62x/evm.c

@@ -19,6 +19,8 @@
 #include <asm/arch/hardware.h>
 #include <dm/uclass.h>
 
+#include "../common/fdt_ops.h"
+
 DECLARE_GLOBAL_DATA_PTR;
 
 #if CONFIG_IS_ENABLED(SPLASH_SCREEN)
@@ -54,6 +56,14 @@ int dram_init(void)
 	return fdtdec_setup_mem_size_base();
 }
 
+#ifdef CONFIG_BOARD_LATE_INIT
+int board_late_init(void)
+{
+	ti_set_fdt_env(NULL, NULL);
+	return 0;
+}
+#endif
+
 int dram_init_banksize(void)
 {
 	return fdtdec_setup_memory_banksize();

configs/am62x_evm_a53_defconfig

@@ -32,6 +32,7 @@ CONFIG_BOOTSTD_FULL=y
 CONFIG_BOOTSTD_DEFAULTS=y
 CONFIG_SYS_BOOTM_LEN=0x800000
 CONFIG_BOOTCOMMAND="run envboot; bootflow scan -lb"
+CONFIG_BOARD_LATE_INIT=y
 CONFIG_SPL_MAX_SIZE=0x58000
 CONFIG_SPL_HAS_BSS_LINKER_SECTION=y
 CONFIG_SPL_BSS_START_ADDR=0x80c80000