nvmem: mtk-efuse: Support postprocessing for GPU speed binning data

On some MediaTek SoCs GPU speed binning data is available for read
in the SoC's eFuse array but it has a format that is incompatible
with what the OPP API expects, as we read a number from 0 to 7 but
opp-supported-hw is expecting a bitmask to enable an OPP entry:
being what we read limited to 0-7, it's straightforward to simply
convert the value to BIT(value) as a post-processing action.

So, introduce post-processing support and enable it by evaluating
the newly introduced platform data's `uses_post_processing` member,
currently enabled only for MT8186.

Signed-off-by: AngeloGioacchino Del Regno <[email protected]>
Signed-off-by: Srinivas Kandagatla <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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