Revert "tty: serial: fsl_lpuart: drop EARLYCON_DECLARE"

Revert "tty: serial: fsl_lpuart: drop EARLYCON_DECLARE"

This reverts commit 4e63739e847a02bd811afa4a5c9496523e9c799c.

This broke the earlycon on LS1021A processors because the order of the
earlycon_setup() functions were changed. Before the commit the normal
lpuart32_early_console_setup() was called. After the commit the
lpuart32_imx_early_console_setup() is called instead.

Fixes: 4e63739e847a ("tty: serial: fsl_lpuart: drop EARLYCON_DECLARE")
Signed-off-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20200303174306.6015-2-michael@walle.cc
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>