ddi_device_zero() function fills the given, bytecount, number of byte of zeroes to the device register or memory.
The dev_advcnt argument determines the value of the device address, dev_addr, on each access. A value of 0 will use the same device
address, dev_addr, on every access. A positive value increments the device address in the next access while a negative value decrements the address. The device address is incremented
and decremented in dev_datasz units.
The dev_datasz argument determines the size of data word on each access.
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