mmc: Standardize header file inclusion checks.

Standardize the checks for multiple MMC header file inclusion,
including adding comments to terminating #endif's, and fixing
one incorrect comment.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 6a68c4e..5666f3a 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -8,8 +8,8 @@
  * the Free Software Foundation; either version 2 of the License, or (at
  * your option) any later version.
  */
-#ifndef __SDHCI_H
-#define __SDHCI_H
+#ifndef LINUX_MMC_SDHCI_H
+#define LINUX_MMC_SDHCI_H
 
 #include <linux/scatterlist.h>
 #include <linux/compiler.h>
@@ -162,4 +162,4 @@
 
 	unsigned long private[0] ____cacheline_aligned;
 };
-#endif /* __SDHCI_H */
+#endif /* LINUX_MMC_SDHCI_H */