sunxi: mk802_defconfig: Remove SYS_EXTRA_OPTIONS

The USB_EHCI configuration is already set in this defconfig
using kconfig's config. This configuration in SYS_EXTRA_OPTIONS
must be removed and so the SYS_EXTRA_OPTIONS.

Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

configs/mk802_defconfig

@@ -4,7 +4,6 @@ CONFIG_MACH_SUN4I=y
 CONFIG_USB2_VBUS_PIN="PH12"
 CONFIG_DEFAULT_DEVICE_TREE="sun4i-a10-mk802"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
-CONFIG_SYS_EXTRA_OPTIONS="USB_EHCI"
 CONFIG_SPL=y
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set