RTC for 5.2

Subsystem:
 - set_mmss and set_mmss64 rtc_ops removal
 - Fix timestamp value for RTC_TIMESTAMP_BEGIN_1900
 - Use SPDX identifier for the core
 - validate upper bound of tm->tm_year

New driver:
 - Aspeed BMC SoC RTC

Drivers:
 - abx80x: use rtc_add_group
 - ds3232: nvram support
 - pcf85063: add alarm, nvram, offset correction and microcrystal rv8263 support
 - x1205: add of_match_table
 - Use set_time instead of set_mms/set_mmss64 for: ab3100, coh901331, digicolor,
   ds1672, ds2404, ep93xx, imxdi, jz4740, lpc32xx, mc13xxx, mxc, pcap, stmp3xxx,
   test, wm831x, xgene.
 - Set RTC range for: ab3100, at91sam9, coh901331, da9063, digicolor, dm355evm,
   ds1672, ds2404, ep39xx, goldfish, imxdi, jz4740, lpc32xx, mc13xxx, mv, mxc,
   omap, pcap, pcf85063, pcf85363, ps3, sh, stmp3xxx, sun4v, tegra, wm831x,
   xgene.
 - Switch to rtc_time64_to_tm/rtc_tm_to_time64 for the driver that properly set
   the RTC range.
 - Use dev_get_drvdata instead of multiple indirections.
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