MIPS: JZ4740: Forward declare struct uart_port in header.

As suggested by Geert Uytterhoeven <[e-mail]>.

Signed-off-by: Ralf Baechle <[e-mail]>
Cc: Antony Pavlov <[e-mail]>
Cc: [e-mail]
Cc: Lars-Peter Clausen <[e-mail]>

arch/mips/jz4740/serial.h

···
 #ifndef __MIPS_JZ4740_SERIAL_H__
 #define __MIPS_JZ4740_SERIAL_H__
 
+struct uart_port;
+
 void jz4740_serial_out(struct uart_port *p, int offset, int value);
 
 #endif