linux

Restore drm_system.{cc,h} #16518

Job	Run time
linux-cobalt / initialize	1m 15s
linux-x64 / initialize	1m 22s
linux-cobalt / docker-build-image	3m 44s
linux-x64 / docker-build-image	3m 42s
linux-cobalt / x64_devel	26m 45s
linux-cobalt / x64_debug	26m 47s
linux-cobalt / x64_qa	26m 0s
linux-cobalt / x64_gold	31m 8s
linux-x64 / x64_devel	25m 49s
linux-x64 / x64_debug	24m 56s
linux-x64 / x64_qa	23m 53s
linux-x64 / x64_gold	30m 19s
	3h 45m 40s

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