parisc: Add wrapper for pdc_instr() firmware function

Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/include/asm/pdc.h

@@ -280,6 +280,7 @@ void setup_pdc(void);		/* in inventory.c */
 /* wrapper-functions from pdc.c */
 
 int pdc_add_valid(unsigned long address);
+int pdc_instr(unsigned int *instr);
 int pdc_chassis_info(struct pdc_chassis_info *chassis_info, void *led_info, unsigned long len);
 int pdc_chassis_disp(unsigned long disp);
 int pdc_chassis_warn(unsigned long *warn);