serial: liteuart: Add support for earlycon

Most litex boards using RISC-V soft cores us the sbi earlycon, however
this is not available for non RISC-V litex SoC's.  This patch enables
earlycon for liteuart which is available on all Litex SoC's making
support for earycon debugging more widely available.

Cc: Florent Kermarrec <[email protected]>
Cc: Mateusz Holenko <[email protected]>
Cc: Joel Stanley <[email protected]>
Cc: Gabriel L. Somlo <[email protected]>
Reviewed-and-tested-by: Gabriel Somlo <[email protected]>
Reviewed-by: Jiri Slaby <[email protected]>
Reviewed-by: Joel Stanley <[email protected]>
Signed-off-by: Stafford Horne <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

0 files changed, 0 insertions, 0 deletions