zipl: Make use of __packed macro

Make use of the pre-defined __packed macro throughout zipl. This
requires adding the global include dir to ALL_CFLAGS.

Signed-off-by: Philipp Rudo <prudo@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

zipl/include/bootmap.h

@@ -12,6 +12,8 @@
 #ifndef BOOTMAP_H
 #define BOOTMAP_H
 
+#include "lib/zt_common.h"
+
 #include "disk.h"
 #include "job.h"
 #include "zipl.h"
@@ -23,7 +25,7 @@ struct signature_header {
 	uint8_t format;
 	uint8_t reserved[3];
 	uint32_t length;
-} __attribute((packed));
+} __packed;
 
 typedef union {
 	uint64_t load_address;