ASoC: wm_adsp: Give the firmware search order KUnit cases distinct names

The wm-adsp-fw-find suite runs wm_adsp_fw_find_test_search_order()
against six different sets of parameters by listing it six times with
KUNIT_CASE_PARAM(), which names each case after the function. All six
cases are therefore called wm_adsp_fw_find_test_search_order, which
makes the results ambiguous.

Use KUNIT_CASE_PARAM_UNIQUE() for these entries so that each case is
also named for the parameter generator it is run with, for example
wm_adsp_fw_find_test_search_order-wm_adsp_fw_find_full_search_gen_params.

Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>