Added funtions to class RTC_PCF8563 for controlling the timer and int…#218

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songspire wants to merge 2 commits intoadafruit:masterfrom songspire:PCF8563_timer_int

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Commits on Jan 16, 2021

Added funtions to class RTC_PCF8563 for controlling the timer and interrupt functionality of PCF8563. Also addedd required definition for the respective registers.
Alex
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added definitions for timer control reg
Alex
committed