configs: imx6q_logic: Move CONFIG_MXC_UART to Kconfig

Since CONFIG_MXC_UART is already in Kconfig, move this from
the header to imx6q_logic_defconfig

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>
2 files changed