drm/bridge: tc358768: Stop disabling when failing to enable

The tc358768 bridge driver, if enabling it fails, tries to disable it.
This is pretty uncommon in bridge drivers, and also stands in the way
for further reworks.

Worse, since pre_enable and enable aren't expected to fail, disable and
post_disable might be called twice: once to handle the failure, and once
to actually disable the bridge.

Since post_disable uses regulators and clocks, this would lead to enable
count imbalances.

In order to prevent that imbalance, and to allow further reworks, let's
drop the calls to disable and post_disable, but keep the warning to let
users know about what's going on.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20250313-bridge-connector-v6-14-511c54a604fb@kernel.org


Signed-off-by: Maxime Ripard <mripard@kernel.org>