linux-yocto: tweak console boot check

linux-yocto: tweak console boot check

    boot/main: don't check console device file on fs when booting with
initrd/initramfs

    In case of initrd/initramfs /dev/console might not exist that early
    as devtmpfs is mounted a bit later by /init process so disable this
    check in that case.

    Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
    Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
(From OE-Core rev: b5bd54b1640c1e59960c260dd6521ba2500df204)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>