board: sama5d4_xplained: add pda detect call at init time

Call the PDA detection mechanism at boot time so we can have
the pda environment variable ready for use.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>

board/atmel/sama5d4_xplained/sama5d4_xplained.c

@@ -17,6 +17,8 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+extern void at91_pda_detect(void);
+
 #ifdef CONFIG_NAND_ATMEL
 static void sama5d4_xplained_nand_hw_init(void)
 {
@@ -71,6 +73,7 @@ static void sama5d4_xplained_usb_hw_init(void)
 #ifdef CONFIG_BOARD_LATE_INIT
 int board_late_init(void)
 {
+	at91_pda_detect();
 #ifdef CONFIG_DM_VIDEO
 	at91_video_show_board_info();
 #endif