MLK-17738 tty: serial: lpuart: restore console setting after power lost

MLK-17738 tty: serial: lpuart: restore console setting after power lost

i.MX7ULP enter VLLS mode that lpuart module power off and registers
all lost no matter the port is wakeup source.

For console port, console baud rate setting lost and print messy
log when enable the console port as wakeup source. To avoid the
issue happen, user should not enable uart port as wakeup source
in VLLS mode, or restore console setting.

The patch is to add one fixup to restore console port register setting
for i.MX7ULP platform.

Reviewed-by: Gao Pan <pandy.gao@nxp.com>
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>