fix: Align an element inside a packed struct

The compiler issues errors when trying to get the reference of elements of
packed structs since it might result in unaligned pointer values.
As such we forced the elements in question to be aligned inside the struct.

Signed-off-by: Miguel Silva <miguelafsilva5@gmail.com>

src/arch/armv8/inc/arch/psci.h

@@ -87,7 +87,7 @@ struct psci_off_state {
     uint64_t vttbr_el2;
     uint64_t wakeup_reason;
     paddr_t flat_map;
-    struct gicc_state gicc_state;
+    struct gicc_state gicc_state __attribute__((aligned(8)));
 } __attribute__((packed, aligned(8)));
 
 enum wakeup_reason {