Input: cros_ec_keyb - Defer probe until parent EC device is registered

The `cros_ec_keyb` driver can be probed before the cros_ec_device has
completed the registration.  This creates a race condition where
`cros_ec_keyb` might access uninitialized data.

Fix this by calling `cros_ec_device_registered()` to check the parent's
status.  If the device is not yet ready, return -EPROBE_DEFER to ensure
the probe is retried later.

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://lore.kernel.org/r/20250828083601.856083-6-tzungbi@kernel.org
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>

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