[config] define uptime feature for MTDs #21

Job	Run time
channel-manager-csl	2m 56s
expects	31m 21s
packet-verification-1-1-on-1-4	10m 53s
packet-verification-low-power	9m 5s
thread-1-4-gcc-m32	11m 14s
thread-1-4-posix	9m 55s
thread-1-4-gcc-m64	11m 11s
thread-1-4-clang-m32	10m 19s
thread-1-4-clang-m64	9m 50s
upload-coverage	0s
	1h 46m 44s

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