imxrt-multi: add support for console over RTT #2142

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	59s
call-ci / build (armv7a9-zynq7000-qemu)	58s
call-ci / build (armv7a9-zynq7000-zedboard)	57s
call-ci / build (armv7a9-zynq7000-zturn)	58s
call-ci / build (armv7m4-stm32l4x6-nucleo)	58s
call-ci / build (armv7m7-imxrt105x-evk)	48s
call-ci / build (armv7m7-imxrt106x-evk)	44s
call-ci / build (armv7m7-imxrt117x-evk)	53s
call-ci / build (host-generic-pc)	47s
call-ci / build (ia32-generic-pc)	58s
call-ci / build (ia32-generic-qemu)	56s
call-ci / build (riscv64-generic-qemu)	57s
call-ci / build (riscv64-generic-spike)	52s
call-ci / build (sparcv8leon3-gr716-mini)	51s
call-ci / test EMU	0s
call-ci / test HW	0s
call-ci / tests-summary	6s
call-ci / send-notification	0s
	12m 42s

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