configs: sama5d2_xplained: enable w1 and overlay for emmc defconfig

Enable onewire support and commands, fdt overlay for the emmc defconfig.
Signed-off-by: NEugen Hristev <eugen.hristev@microchip.com>

configs/sama5d2_xplained_emmc_defconfig

@@ -15,7 +15,6 @@ CONFIG_DEBUG_UART_BASE=0xf8020000
 CONFIG_DEBUG_UART_CLOCK=83000000
 CONFIG_SPL_FAT_SUPPORT=y
 CONFIG_SPL_LIBDISK_SUPPORT=y
-CONFIG_DEFAULT_DEVICE_TREE="at91-sama5d2_xplained"
 CONFIG_DEBUG_UART=y
 CONFIG_ENV_VARS_UBOOT_CONFIG=y
 CONFIG_FIT=y
@@ -40,6 +39,7 @@ CONFIG_CMD_EXT4=y
 CONFIG_CMD_FAT=y
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
+CONFIG_DEFAULT_DEVICE_TREE="at91-sama5d2_xplained"
 CONFIG_OF_SPL_REMOVE_PROPS="interrupts interrupt-parent dmas dma-names"
 CONFIG_ENV_IS_IN_FAT=y
 CONFIG_ENV_FAT_DEVICE_AND_PART="0:1"
@@ -85,3 +85,8 @@ CONFIG_USB_GADGET=y
 CONFIG_USB_GADGET_ATMEL_USBA=y
 CONFIG_DM_VIDEO=y
 CONFIG_ATMEL_HLCD=y
+CONFIG_W1=y
+CONFIG_W1_GPIO=y
+CONFIG_W1_EEPROM=y
+CONFIG_W1_EEPROM_DS24XXX=y
+CONFIG_OF_LIBFDT_OVERLAY=y