mfd: kempld: Remove custom DMI matching code

The ->init() open codes the functionality of DMI matching code.
Moreover, all DMI quirks are using the same callback and driver_data.
With this in mind, refactor the DMI matching code.

Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: andy-shev