board: toradex: colibri_vf: drop SPI support

Drop SPI support saving precious 4 Kb on boards with tough size
restrictions.
Signed-off-by: NMarcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: NMarcel Ziswiler <marcel@ziswiler.com>

configs/colibri_vf_defconfig

@@ -24,7 +24,6 @@ CONFIG_CMD_DFU=y
 CONFIG_CMD_FUSE=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_MMC=y
-CONFIG_CMD_SPI=y
 CONFIG_CMD_USB=y
 CONFIG_CMD_USB_MASS_STORAGE=y
 # CONFIG_CMD_SETEXPR is not set
@@ -56,9 +55,6 @@ CONFIG_PHY_MICREL=y
 CONFIG_MII=y
 CONFIG_DM_SERIAL=y
 CONFIG_FSL_LPUART=y
-CONFIG_SPI=y
-CONFIG_DM_SPI=y
-CONFIG_FSL_DSPI=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_USB_EHCI_HCD=y