x86: Convert some debug statements to use logging

Move from using debug() to log_debug() so that we don't have to use the
__func__ parameter and can access other logging features.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/pch/pch9.c b/drivers/pch/pch9.c
index 3bd0115..3137eb2 100644
--- a/drivers/pch/pch9.c
+++ b/drivers/pch/pch9.c
@@ -3,6 +3,8 @@
  * Copyright (C) 2014 Google, Inc
  */
 
+#define LOG_CATEGORY	UCLASS_PCH
+
 #include <common.h>
 #include <dm.h>
 #include <log.h>
@@ -38,7 +40,7 @@
 	 */
 	dm_pci_read_config32(dev, GPIO_BASE, &base);
 	if (base == 0x00000000 || base == 0xffffffff) {
-		debug("%s: unexpected BASE value\n", __func__);
+		log_debug("unexpected BASE value\n");
 		return -ENODEV;
 	}
 
@@ -59,7 +61,7 @@
 
 	dm_pci_read_config32(dev, IO_BASE, &base);
 	if (base == 0x00000000 || base == 0xffffffff) {
-		debug("%s: unexpected BASE value\n", __func__);
+		log_debug("unexpected BASE value\n");
 		return -ENODEV;
 	}