If including MX7D in CONFIG_SYS_EXTRA_OPTIONS, CONFIG_ROM_UNIFIED_SECTIONS will not effect.So move MX7D to Kconfig entry from CONFIG_SYS_EXTRA_OPTIONS to "select MX7D" to boards using i.MX7 Dual.
Signed-off-by: Peng Fan
CONFIG_ARM=y CONFIG_ARCH_MX7=y CONFIG_TARGET_MX7DSABRESD=y CONFIG_IMX_RDC=y CONFIG_IMX_BOOTAUX=y CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx7dsabresd/imximage.cfg,MXC_EPDC" CONFIG_CMD_GPIO=y CONFIG_CMD_DHCP=y CONFIG_CMD_PING=y
