rtc.h is not needed in alarmtimers when a forward declaration of struct
rtc_device is provided. That allows to include posix-timers.h without
adding more includes to alarmtimer.h or creating circular include
dependencies.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lkml.kernel.org/r/20190819143801.565389536@linutronix.de
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