main/postmarketos-initramfs: allow redirect logs to pmsg device
When /dev/pmsg0 is available, write logs into it, so logs can be recovered through pstore after a failed boot. This is useful for devices without console or hard to get console.
When /dev/pmsg0 is available, write logs into it, so logs can be recovered through pstore after a failed boot. This is useful for devices without console or hard to get console.