platform/chrome: cros_ec_lpc: Merge lpc_driver_ops into ec private structure

Remove cros_ec_lpc_ops global variable, since EC specific info can be
stored in the device private structure, introduced in
commit e4dbf9d6 ("platform/chrome: cros_ec_lpc: add a "quirks" system").

Add ec_lpc pointer to read/write function to be able to access ec
specific data.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Link: https://lore.kernel.org/r/20250107174514.2748108-2-gwendal@chromium.org


Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>