src/{device,include}: Use PNP_IDX_EN instead of magic number

Change-Id: I68590605e261ecaace9f3cea28cfa6ec3b913a8a
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44835
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/device/pnp_device.c b/src/device/pnp_device.c
index cd7adf3..9fa032e 100644
--- a/src/device/pnp_device.c
+++ b/src/device/pnp_device.c
@@ -5,6 +5,7 @@
 #include <arch/io.h>
 #include <device/device.h>
 #include <device/pnp.h>
+#include <device/pnp_def.h>
 
 /* PNP config mode wrappers */
 
@@ -56,7 +57,7 @@
 {
 	u8 tmp, bitpos;
 
-	tmp = pnp_read_config(dev, 0x30);
+	tmp = pnp_read_config(dev, PNP_IDX_EN);
 
 	/* Handle virtual devices, which share the same LDN register. */
 	bitpos = (dev->path.pnp.device >> 8) & 0x7;
@@ -66,14 +67,14 @@
 	else
 		tmp &= ~(1 << bitpos);
 
-	pnp_write_config(dev, 0x30, tmp);
+	pnp_write_config(dev, PNP_IDX_EN, tmp);
 }
 
 int pnp_read_enable(struct device *dev)
 {
 	u8 tmp, bitpos;
 
-	tmp = pnp_read_config(dev, 0x30);
+	tmp = pnp_read_config(dev, PNP_IDX_EN);
 
 	/* Handle virtual devices, which share the same LDN register. */
 	bitpos = (dev->path.pnp.device >> 8) & 0x7;