RTC for 6.5

Subsystem:
 - Switch i2c drivers back to use .probe()
 - Constify pointers to hwmon_channel_info

New driver:
 - Loongson on chip RTC, replacing the Loongson 1 only driver

Drivers:
 - isl1208: cleanup and support for RAA215300
 - st-lpc: cleanups
 - stm32: fix wakeup
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