tty/early: make serial8250_early_{in,out} static again

Commit ed71871bed719 ("tty/8250_early: Turn serial_in/serial_out into
weak symbols") made these routines weak to allow platform specific
Big endian override

However recent updates to core, specifically ebc5e20082 ("serial:
of_serial: Support big-endian register accesses") and 6e63be3fee14
("serial: earlycon: Add support for big-endian MMIO accesses") means
that round about way to overide the early serial accessors is no longer
needed.

Cc: Jiri Slaby <[e-mail]>
Cc: Peter Hurley <[e-mail]>
Cc: Rob Herring <[e-mail]>
Cc: Kevin Cernekee <[e-mail]>
Acked-by: Noam Camus <[e-mail]>
Signed-off-by: Vineet Gupta <[e-mail]>
Reviewed-by: Peter Hurley <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/8250/8250_early.c

···
 #include <asm/io.h>
 #include <asm/serial.h>
 
-unsigned int __weak __init serial8250_early_in(struct uart_port *port, int offset)
+static unsigned int __init serial8250_early_in(struct uart_port *port, int offset)
 {
 	switch (port->iotype) {
 	case UPIO_MEM:
···
 	}
 }
 
-void __weak __init serial8250_early_out(struct uart_port *port, int offset, int value)
+static void __init serial8250_early_out(struct uart_port *port, int offset, int value)
 {
 	switch (port->iotype) {
 	case UPIO_MEM:

include/linux/serial_8250.h

···
 
 extern int early_serial_setup(struct uart_port *port);
 
-extern unsigned int serial8250_early_in(struct uart_port *port, int offset);
-extern void serial8250_early_out(struct uart_port *port, int offset, int value);
 extern int early_serial8250_setup(struct earlycon_device *device,
 					 const char *options);
 extern void serial8250_do_set_termios(struct uart_port *port,