src/include: Add do { } while(0) around macros

Fix the following error detected by checkpatch.py:

ERROR: Macros with multiple statements should be enclosed in a do - while loop

False positives are generated when assembly code is used in a macro.  An
example is:

ERROR: Macros with multiple statements should be enclosed in a do - while loop
+#define post_code(value)        \
+	movb    $value, %al;    \
+	outb    %al, $CONFIG_POST_IO_PORT

False positives are also generated for linker script include files.  An
example is:

ERROR: Macros with multiple statements should be enclosed in a do - while loop
+#define SET_COUNTER(name, addr) \
+	_ = ASSERT(. <= addr, STR(name overlaps the previous region!));
\
+	. = addr;

False positives are also generated for attribute macros.  An example is:

ERROR: Macros with multiple statements should be enclosed in a do - while loop
+#define DISABLE_TRACE_ON_FUNCTION  __attribute__
((no_instrument_function));

TEST=Build and run on Galileo Gen2

Change-Id: I88abf96579e906f6962d558a3d09907f07d00b1c
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18644
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/include/bootstate.h

@@ -125,7 +125,9 @@ struct boot_state_callback {
 #define BOOT_STATE_CALLBACK_LOC __FILE__ ":" STRINGIFY(__LINE__)
 #define BOOT_STATE_CALLBACK_INIT_DEBUG .location = BOOT_STATE_CALLBACK_LOC,
 #define INIT_BOOT_STATE_CALLBACK_DEBUG(bscb_) 			\
-	bscb_->location = BOOT_STATE_CALLBACK_LOC;
+	do {							\
+		bscb_->location = BOOT_STATE_CALLBACK_LOC;	\
+	} while (0)
 #else
 #define BOOT_STATE_CALLBACK_INIT_DEBUG
 #define INIT_BOOT_STATE_CALLBACK_DEBUG(bscb_)
@@ -144,9 +146,11 @@ struct boot_state_callback {
 
 /* Initialize an allocated boot_state_callback. */
 #define INIT_BOOT_STATE_CALLBACK(bscb_, func_, arg_)	\
+	do {						\
 		INIT_BOOT_STATE_CALLBACK_DEBUG(bscb_)	\
 		bscb_->callback = func_;		\
-	bscb_->arg = arg_
+		bscb_->arg = arg_			\
+	} while(0)
 
 /* The following 2 functions schedule a callback to be called on entry/exit
  * to a given state. Note that there are no ordering guarantees between the