pps: Fix build breakage from decoupling pps from tty

Fixes:
tree:   git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git

 tty-next
head:   bc80fbe4
commit: 593fb1ae pps: Move timestamp read into PPS code proper
date:   78 minutes ago
config: make ARCH=sparc defconfig

All error/warnings:

   In file included from drivers/tty/serial/suncore.c:20:0:
>> include/linux/sunserialcore.h:29:15: warning: 'struct device_node' declared inside parameter list [enabled by default]
>> include/linux/sunserialcore.h:29:15: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
>> include/linux/sunserialcore.h:31:18: warning: 'struct device_node' declared inside parameter list [enabled by default]
>> drivers/tty/serial/suncore.c:55:5: error: conflicting types for 'sunserial_console_match'
   include/linux/sunserialcore.h:28:12: note: previous declaration of 'sunserial_console_match' was here
>> drivers/tty/serial/suncore.c:83:1: error: conflicting types for 'sunserial_console_match'
   include/linux/sunserialcore.h:28:12: note: previous declaration of 'sunserial_console_match' was here
>> drivers/tty/serial/suncore.c:85:6: error: conflicting types for 'sunserial_console_termios'
   include/linux/sunserialcore.h:30:13: note: previous declaration of 'sunserial_console_termios' was here

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Cc: George Spelvin <linux@horizon.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>