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>

configs/imx6q_logic_defconfig

@@ -39,3 +39,4 @@ CONFIG_PINCTRL=y
 CONFIG_PINCTRL_IMX6=y
 CONFIG_DM_PMIC_PFUZE100=y
 CONFIG_DM_REGULATOR_PFUZE100=y
+CONFIG_MXC_UART=y

include/configs/imx6_logic.h

@@ -18,8 +18,6 @@
 /* Size of malloc() pool */
 #define CONFIG_SYS_MALLOC_LEN          (10 * SZ_1M)
 
-#define CONFIG_MXC_UART
-
 /* MMC Configs */
 #define CONFIG_SYS_FSL_ESDHC_ADDR      0
 #define CONFIG_SYS_FSL_USDHC_NUM       2