AVR: Use more bool.

Now that the C default is C23, we can use bool in avr.h
(which is still used in libgcc via tm.h).
bool is a keyword in C23, so no stdbool.h is required in libgcc.

gcc/
	* config/avr/avr.h (avr_args.has_stack_args): Be a bool.
	(struct machine_function) <is_naked, is_noblock, is_OS_task,
	is_OS_task, sibcall_fails, attributes_checked_p, is_no_gccisr,
	use_L__stack_usage, gasisr.yes, gasisr.maybe>: Same.
	* config/avr/avr-protos.h (reg_unused_after)
	(test_hard_reg_class, jump_over_one_insn_p): Use bool as
	return type.
	* config/avr/avr.cc (reg_unused_after)
	(test_hard_reg_class, jump_over_one_insn_p): Same.
	(cfun->machine->attributes_checked_p, cum->has_stack_args)
	(cfun->machine->use_L__stack_usage, cfun->machine->gasisr.yes)
	(cfun->machine->sibcall_fails): Use like a bool.

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