x86: re-add reboot fixups

Jan Beulich noticed that the reboot fixups went missing during
reboot.c unification.

(commit 4d022e35fd7e07c522c7863fee6f07e53cf3fc14)

Geode and a few other rare boards with special reboot quirks are
affected.

Reported-by: Jan Beulich <[e-mail]>
Signed-off-by: Jan Beulich <[e-mail]>
Signed-off-by: Ingo Molnar <[e-mail]>

arch/x86/kernel/reboot.c

···
 	}
 }
 
+void __attribute__((weak)) mach_reboot_fixups(void)
+{
+}
+
 static void native_machine_emergency_restart(void)
 {
 	int i;
···
 		/* Could also try the reset bit in the Hammer NB */
 		switch (reboot_type) {
 		case BOOT_KBD:
+			mach_reboot_fixups(); /* for board specific fixups */
+
 			for (i = 0; i < 10; i++) {
 				kb_wait();
 				udelay(50);