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/arch/x86/acpi.c

@@ -855,7 +855,7 @@ void acpi_create_fadt(acpi_fadt_t *fadt, acpi_facs_t *facs, void *dsdt)
 }
 #endif
 
-unsigned long __attribute__ ((weak)) fw_cfg_acpi_tables(unsigned long start)
+unsigned long __attribute__((weak)) fw_cfg_acpi_tables(unsigned long start)
 {
 	return 0;
 }
@@ -1122,7 +1122,7 @@ void acpi_save_gnvs(u32 gnvs_address)
 		*gnvs = gnvs_address;
 }
 
-__attribute__ ((weak)) int acpi_get_gpe(int gpe)
+__attribute__((weak)) int acpi_get_gpe(int gpe)
 {
 	return -1; /* implemented by SOC */
 }