arm64: include linux/types.h in asm/spinlock_types.h

Our ticket-based spinlock structures rely on a definition of u16, so
include linux/types.h explicitly to ensure the thing compiles.

Found by a module build failure in -next:

arch/arm64/include/asm/spinlock_types.h:27:2: error: unknown type name 'u16'
arch/arm64/include/asm/spinlock_types.h:28:2: error: unknown type name 'u16'
arch/arm64/include/asm/spinlock_types.h:33:13: error: expected declaration specifiers or '...' before numeric constant
include/linux/spinlock_types.h:21:2: error: unknown type name 'arch_spinlock_t'
arch/arm64/include/asm/spinlock.h:34:35: error: unknown type name 'arch_spinlock_t'
arch/arm64/include/asm/spinlock.h:65:37: error: unknown type name 'arch_spinlock_t'

Reported-by: Russell King <[e-mail]>
Signed-off-by: Will Deacon <[e-mail]>

arch/arm64/include/asm/spinlock_types.h

···
 # error "please don't include this file directly"
 #endif
 
+#include <linux/types.h>
+
 #define TICKET_SHIFT	16
 
 typedef struct {