ASoC: SOF: Remove unused Broxton PCI ID

ASoC: SOF: Remove unused Broxton PCI ID

Current code references 0x1a98 which is BXT-M (not -T as it is
commented) and it's an RVP, BXT-M B0 to be specific. From what we know
no BXT is available on market.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Link: https://lore.kernel.org/r/20230717114511.484999-4-amadeuszx.slawinski@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>