superio: Replace the indexed I/O functions

Replace the multiple indexed I/O read and write
functions with common functions.

Change-Id: Idfe7a8784c28d51b3fbcb2f4e26beaa0b91741a8
Signed-off-by: Dave Frodin <dave.frodin@se-eng.com>
Reviewed-on: http://review.coreboot.org/10145
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/superio/fintek/f71869ad/f71869ad_hwm.c

@@ -55,12 +55,6 @@
 #define HWM_FAN1_SEG3_SPEED_COUNT  0xAC
 #define HWM_FAN1_TEMP_MAP_SEL      0xAF
 
-static void pnp_write_index(u16 port, u8 reg, u8 value)
-{
-	outb(reg, port);
-	outb(value, port + 1);
-}
-
 /* note: multifunc registers need to be tweaked before here */
 void f71869ad_hwm_init(struct device *dev)
 {