add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/Documentation/ABI/testing/sysfs-class-rtc-rtc0-device-rtc_calibration
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@@ -7,6 +7,7 @@
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                 calibrate the AB8500.s 32KHz Real Time Clock.
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                 Every 60 seconds the AB8500 will correct the RTC's value
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                 by adding to it the value of this attribute.
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                 The range of the attribute is -127 to +127 in units of
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                 30.5 micro-seconds (half-parts-per-million of the 32KHz clock)
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 Users:          The /vendor/st-ericsson/base_utilities/core/rtc_calibration