mfd: cros_ec_dev: Only register PCHG device if present

Don't create a device for the peripheral charger (PCHG) if there aren't
any peripheral charger ports. This removes a device on most ChromeOS
systems, because the peripheral charger functionality isn't always
present.

Cc: Prashant Malani <[email protected]>
Cc: Tzung-Bi Shih <[email protected]>
Cc: Daisuke Nojiri <[email protected]>
Cc: Benson Leung <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Reviewed-by: Prashant Malani <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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