board: sama5d3_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>
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 69856c8..3784cbb 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -177,6 +177,7 @@
 	select BOARD_EARLY_INIT_F
 	select SAMA5D3
 	select SUPPORT_SPL
+	select BOARD_LATE_INIT
 
 config TARGET_SAMA5D3XEK
 	bool "SAMA5D3X-EK board"