allow init to open kmsg_debug

The 'stdio_to_kmsg' option will print stdout and stderr to
kmsg_debug.  This requires init to be able to open kmsg_debug.

Test: services with stdio_to_kmsg can print to kmsg_debug
Change-Id: I63f0af8f079f7327c1224aa9e46f19d6549d875b
1 file changed