iio:dac:ad5592r: Drop of_match_ptr and ACPI_PTR protections.

These result in a very small reduction in driver size, but at the
cost of more complex build and slightly harder to read code.
In the case of of_match_ptr it also prevents use of PRP0001
ACPI based identification.  In this particular case we have
a valid ACPI/PNP ID that I am assuming was issued by Analog
Devices.  That should be used in preference to PRP0001 but doesn't
mean we should prevent that route.

Signed-off-by: Jonathan Cameron <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Cc: Michael Hennerich <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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