overflow: Use POD in check_shl_overflow()

The check_shl_overflow() uses u64 type that is defined in types.h.
Instead of including that header, just switch to use POD type
directly.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20240228204919.3680786-2-andriy.shevchenko@linux.intel.comSigned-off-by: Kees Cook <keescook@chromium.org>

include/linux/overflow.h

@@ -197,7 +197,7 @@ static inline bool __must_check __must_check_overflow(bool overflow)
 	typeof(a) _a = a;						\
 	typeof(s) _s = s;						\
 	typeof(d) _d = d;						\
-	u64 _a_full = _a;						\
+	unsigned long long _a_full = _a;				\
 	unsigned int _to_shift =					\
 		is_non_negative(_s) && _s < 8 * sizeof(*d) ? _s : 0;	\
 	*_d = (_a_full << _to_shift);					\