iio:gyro:mpu3050 Treat otp value as a __le64 and use FIELD_GET() to break up

Inspired by Andy Shevchenko's proposal to use get_unaligned_leXX().

The whole one time programable memory is treated as a single 64bit
little endian value.  Thus we can avoid a lot of messy handling
of fields overlapping byte boundaries by just loading and manipulating
it as an __le64 converted to a u64.  That lets us just use FIELD_GET()
and GENMASK() to extract the values desired.

Note only build tested. We need to use GENMASK_ULL and %llX formatters
to account for the larger types used in computing the various fields.

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

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