drm/panfrost: rename error labels in device_init

drm/panfrost: rename error labels in device_init

[ Upstream commit d3c335da0200be9287cdf5755d19f62ce1670a8d ]

Rename goto labels in device_init it will be easier to maintain.

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200710095409.407087-8-peron.clem@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>