ASoC: Intel: avs: Clean up the bus when its initialization fails

snd_hdac_i915_init() which is part of the initialization may return
-EPROBE_DEFER what fails the procedure and the existing avs_bus_init()
and avs_pci_probe() do not clean up the bus fields with
snd_hdac_ext_bus_exit() when that happens.

Fix avs_bus_init() by rearranging the initialization blocks: allocations
first, snd_hdac_ext_bus_init() last. Such approach generates no
error-path whilst still achieving the goal of cleaning up the bus.
For avs_pci_probe() update the existing error-path instead.

Co-developed-by: Amadeusz Sławiński <amade@asmblr.net>
Signed-off-by: Amadeusz Sławiński <amade@asmblr.net>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://patch.msgid.link/20260902081814.1590883-4-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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