Recent OpenSBI versions implement shutdown and reboot through the DA9063
PMIC, but expect the I2C controller to remain enabled. Adjust ociic(4)
such that this is the case.

ok jca@

constify struct cfattach

Make sure the bus is idle before starting a transfer.

ok deraadt@

Add ociic(4) and dapmic(4). The first is a driver for the OpenCores I2C
controller and the latter is a driver for the Dialog DA9063 PMIC. The
dapmic(4) driver currently supports the integrated RTC

Add ociic(4) and dapmic(4). The first is a driver for the OpenCores I2C
controller and the latter is a driver for the Dialog DA9063 PMIC. The
dapmic(4) driver currently supports the integrated RTC and also provides
support for resetting and powering down an application processor. This
functionality is used to support rebooting the SiFive Unmatched board.

ok deraadt@

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