LF-40 ARM: imx_v6_v7_defconfig: remove HCI SDIO config

IMX bluetooth support interface is HCI UART. Remove HCI SDIO
interface since there have HIF conflict for cypress bluetooth.

Reviewed-by: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>