ALSA: kunit: Fix sparse warnings

There were a few sparse warnings about the cast of strong-typed
snd_pcm_format_t.  Fix them with cast with __force.

For spreading the ugly mess, put them in the definitions
WRONG_FORMAT_1 and WRONG_FORMAT_2 and use them in the callers.

Fixes: 3e39acf5 ("ALSA: core: Add sound core KUnit test")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/r/202402270303.PmvmQrJV-lkp@intel.com
Link: https://lore.kernel.org/r/20240227104912.18921-1-tiwai@suse.de


Signed-off-by: Takashi Iwai <tiwai@suse.de>