platform/chrome: cros_ec_proto: Fix check_features ret val

The kerneldoc for cros_ec_check_features() states that it returns 1 or 0
depedending on whether a feature is supported or not, but it instead
returns a negative error number in one case, and a non-1 bitmask in
other cases.

Since all call-sites only check for a 1 or 0 return value, update
the function to return boolean values.

Signed-off-by: Prashant Malani <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Signed-off-by: Enric Balletbo i Serra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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