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/include/cpu/cpu.h

@@ -10,7 +10,7 @@ void initialize_cpus(struct bus *cpu_bus);
 asmlinkage void secondary_cpu_init(unsigned int cpu_index);
 int cpu_phys_address_size(void);
 
-#define __cpu_driver __attribute__ ((used, __section__(".rodata.cpu_driver")))
+#define __cpu_driver __attribute__((used, __section__(".rodata.cpu_driver")))
 #ifndef __SIMPLE_DEVICE__
 /** start of compile time generated pci driver array */
 extern struct cpu_driver _cpu_drivers[];