cm_fx6: Remove SPL entry from CONFIG_SYS_EXTRA_OPTIONS

SPL is already selected via CONFIG_SPL=y, so there is no need
to pass it inside CONFIG_SYS_EXTRA_OPTIONS.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
diff --git a/configs/cm_fx6_defconfig b/configs/cm_fx6_defconfig
index a548d8f..fa5d9e3 100644
--- a/configs/cm_fx6_defconfig
+++ b/configs/cm_fx6_defconfig
@@ -12,7 +12,7 @@
 CONFIG_VIDEO=y
 # CONFIG_CMD_BMODE is not set
 CONFIG_OF_BOARD_SETUP=y
-CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/imx-common/spl_sd.cfg,MX6QDL,SPL"
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/imx-common/spl_sd.cfg,MX6QDL"
 CONFIG_BOOTDELAY=3
 CONFIG_SPL=y
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0x80