x86: Add various minor tidy-ups in mrccache codes

Fix some nits, improve some comments and reorder some codes
a little bit.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/include/asm/mrccache.h b/arch/x86/include/asm/mrccache.h
index ff41b8a..2fd9082 100644
--- a/arch/x86/include/asm/mrccache.h
+++ b/arch/x86/include/asm/mrccache.h
@@ -1,17 +1,17 @@
 /*
- * Copyright (c) 2014 Google, Inc
+ * Copyright (C) 2014 Google, Inc
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
-#ifndef _ASM_ARCH_MRCCACHE_H
-#define _ASM_ARCH_MRCCACHE_H
+#ifndef _ASM_MRCCACHE_H
+#define _ASM_MRCCACHE_H
 
 #define MRC_DATA_ALIGN		0x1000
-#define MRC_DATA_SIGNATURE	(('M' << 0) | ('R' << 8) | ('C' << 16) | \
-					('D'<<24))
+#define MRC_DATA_SIGNATURE	(('M' << 0) | ('R' << 8) | \
+				 ('C' << 16) | ('D'<<24))
 
-__packed struct mrc_data_container {
+struct __packed mrc_data_container {
 	u32	signature;	/* "MRCD" */
 	u32	data_size;	/* Size of the 'data' field */
 	u32	checksum;	/* IP style checksum */
@@ -28,7 +28,7 @@
  * This searches the MRC cache region looking for the latest record to use
  * for setting up SDRAM
  *
- * @entry:	Information about the position and size of the MRC cache
+ * @entry:	Position and size of MRC cache in SPI flash
  * @return pointer to latest record, or NULL if none
  */
 struct mrc_data_container *mrccache_find_current(struct fmap_entry *entry);
@@ -36,8 +36,8 @@
 /**
  * mrccache_update() - update the MRC cache with a new record
  *
- * This writes a new record to the end of the MRC cache. If the new record is
- * the same as the latest record then the write is skipped
+ * This writes a new record to the end of the MRC cache region. If the new
+ * record is the same as the latest record then the write is skipped
  *
  * @sf:		SPI flash to write to
  * @entry:	Position and size of MRC cache in SPI flash
@@ -48,4 +48,4 @@
 int mrccache_update(struct udevice *sf, struct fmap_entry *entry,
 		    struct mrc_data_container *cur);
 
-#endif
+#endif /* _ASM_MRCCACHE_H */