rtc-4.7

RTC for 4.7

Subsystem wide cleanups:
 - Use IS_ENABLED() instead of checking for built-in or module
 - remove useless DRV_VERSION
 - remove CLK_IS_ROOT
 - remove UIE signaling

Drivers:
 - ds1302: rewritten to be a proper SPI device driver
 - m41t80: huge cleanup, alarm, wakelarm ans oscialltor failure detection
 support
 - rv3029: switch to regmap to handle rv3049, alarm support, fixes
 - zynqmp: enable switching to battery power, fixes
 - small fixes for at91sam9, da9053, ds1307, ds1685, ds3232, r2025, sa1100,
 snvs, stmp3xxx, tps6586x
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