Rename __attribute__((packed)) --> __packed

Also unify __attribute__ ((..)) to __attribute__((..)) and
handle ((__packed__)) like ((packed))

Change-Id: Ie60a51c3fa92b5009724a5b7c2932e361bf3490c
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: https://review.coreboot.org/15921
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/common/mma.c

@@ -13,6 +13,7 @@
  * GNU General Public License for more details.
  */
 
+#include <compiler.h>
 #include <bootstate.h>
 #include <cbfs.h>
 #include <cbmem.h>
@@ -31,7 +32,7 @@
 struct mma_data_container {
 	uint32_t mma_signature; /* "MMAD" */
 	uint8_t mma_data[0]; /* Variable size, platform/run time dependent. */
-} __attribute__ ((packed));
+} __packed;
 
 /*
  * Format of the MMA test metadata file, stored under CBFS