Add an assembly guard around linux/bitops.h

This file can be included by any header but it includes C code. Guard it
to avoid errors when compiling ASL, etc.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 6b509dc..16f2899 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -1,7 +1,7 @@
 #ifndef _LINUX_BITOPS_H
 #define _LINUX_BITOPS_H
 
-#ifndef USE_HOSTCC
+#if !defined(USE_HOSTCC) && !defined(__ASSEMBLY__)
 
 #include <asm/types.h>
 #include <asm-generic/bitsperlong.h>
@@ -218,6 +218,6 @@
 	*p &= ~mask;
 }
 
-#endif /* !USE_HOSTCC */
+#endif /* !USE_HOSTCC && !__ASSEMBLY__ */
 
 #endif