boards/arduino101: Enable UART 0 controller
boards/arduino101: Enable UART 0 controller

boards/x86/arduino_101/arduino_101_defconfig currently enables
CONFIG_UART_QMSI_0_HW_FC (HW flow control on UART 0), but doesn't enable
CONFIG_UART_QMSI_0 (the UART itself), which is a direct dependency.

This means CONFIG_UART_QMSI_0_HW_FC remains disabled despite the request
to enable it, and kconfig.py prints a warning.

Enable CONFIG_UART_QMSI_0 in the arduino_101_defconfig.

Signed-off-by: Ulf Magnusson <f650684f780c6b48c0158c4e0f2e27f74aabc755@gmail.com>

punitvara/zephyr,zephyriot/zephyr,kraj/zephyr,ldts/zephyr,kraj/zephyr,punitvara/zephyr,nashif/zephyr,galak/zephyr,nashif/zephyr,finikorg/zephyr,zephyriot/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,ldts/zephyr,mbolivar/zephyr,Vudentz/zephyr,nashif/zephyr,mbolivar/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,explora26/zephyr,kraj/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,mbolivar/zephyr,mbolivar/zephyr,finikorg/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,zephyriot/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,Vudentz/zephyr,mbolivar/zephyr,ldts/zephyr,Vudentz/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,ldts/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,zephyriot/zephyr,zephyriot/zephyr,zephyrproject-rtos/zephyr,kraj/zephyr,Vudentz/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,punitvara/zephyr,explora26/zephyr,explora26/zephyr