iio:chemical:sgp30: Drop of_match_ptr and use generic fw accessors

This change allow the driver to be used with ACPI PRP0001 and removes
an antipattern that I want to avoid being copied into new IIO drivers.

The handling of match_data uses a different approach as
device_get_match_data doesn't distinguish between no match, and
a match but with NULL data.

Signed-off-by: Jonathan Cameron <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Cc: Andreas Brauchli <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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