inittab: fallback when multiple "console=" is detected

[musashino205]

This patch series is required for providing dmesg output support on "SERIAL" port (ttyATH1) in addition to "SERVICE" (ttyS0) on ELECOM WAB-I1750-PS.

example

bootargs: console=ttyATH1,115200n8 console=ttyS0,115200n8

• current:

  • Linux (/dev/console): ttyS0
  • procd: ttyATH1

• after changes:

  • Linux (/dev/console): ttyS0
  • procd: ttyS0 (from /dev/console)

[robimarko]

Thanks! Rebased on top of master and merged!