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rtc-pcf8563-guf: prevent resetting of TIE bit to support bootselect

Mikhail Vanyulin requested to merge kirkstone-updated-rtc-pcf8563-guf-for-bootselect into kirkstone

Save the value of TIE bit value before resetting CONTROL_STATUS_2 register in probe() routine of PCF8563 driver. Otherwise, a bootselect functionality stops working because it stores some information across reboot in RTC registers.

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