Add rtc reset function.
On reset: Periodic Interrupt Enable (PIE) bit is cleared to zero Alarm Interrupt Enable (AIE) bit is cleared to zero Update ended Interrupt Flag (UF) bit is cleared to zero Interrupt Request status Flag (IRQF) bit is cleared to zero Periodic Interrupt Flag (PF) bit is cleared to zero Alarm Interrupt Flag (AF) bit is cleared to zero Square Wave output Enable (SQWE) zero Signed-off-by: NGleb Natapov <gleb@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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