x86: consolidate header guards

This patch is the result of an automatic script that consolidates the
format of all the headers in include/asm-x86/.

The format:

1. No leading underscore. Names with leading underscores are reserved.
2. Pathname components are separated by two underscores. So we can
   distinguish between mm_types.h and mm/types.h.
3. Everything except letters and numbers are turned into single
   underscores.

Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
diff --git a/include/asm-x86/gpio.h b/include/asm-x86/gpio.h
index ff87fca..f269ff9 100644
--- a/include/asm-x86/gpio.h
+++ b/include/asm-x86/gpio.h
@@ -1,6 +1,6 @@
-#ifndef _ASM_I386_GPIO_H
-#define _ASM_I386_GPIO_H
+#ifndef ASM_X86__GPIO_H
+#define ASM_X86__GPIO_H
 
 #include <gpio.h>
 
-#endif /* _ASM_I386_GPIO_H */
+#endif /* ASM_X86__GPIO_H */