include: types: Add __aligned(x) to define the minimum alignement

The __aligned(x) macro is a common wrapper around compiler's
aligned attribute, which allow to define the minimum alignement
of a data type. Let's add this macro.

Signed-off-by: Christoph Muellner <cmuellner@linux.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

include/sbi/sbi_types.h

@@ -63,6 +63,7 @@ typedef unsigned long		physical_size_t;
 
 #define __packed		__attribute__((packed))
 #define __noreturn		__attribute__((noreturn))
+#define __aligned(x)		__attribute__((aligned(x)))
 
 #define likely(x) __builtin_expect((x), 1)
 #define unlikely(x) __builtin_expect((x), 0)