serial: Remove duplicated macro definition of port type

There exists the same macro definition of port type from 0 to 13
in include/uapi/linux/serial.h, remove these duplicated code in
include/uapi/linux/serial_core.h which includes the former header.

Acked-by: Jiri Slaby <[e-mail]>
Signed-off-by: Tiezhu Yang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

include/uapi/linux/serial_core.h

···
 /*
  * The type definitions.  These are from Ted Ts'o's serial.h
  */
-#define PORT_UNKNOWN	0
-#define PORT_8250	1
-#define PORT_16450	2
-#define PORT_16550	3
-#define PORT_16550A	4
-#define PORT_CIRRUS	5
-#define PORT_16650	6
-#define PORT_16650V2	7
-#define PORT_16750	8
-#define PORT_STARTECH	9
-#define PORT_16C950	10
-#define PORT_16654	11
-#define PORT_16850	12
-#define PORT_RSA	13
 #define PORT_NS16550A	14
 #define PORT_XSCALE	15
 #define PORT_RM9000	16	/* PMC-Sierra RM9xxx internal UART */