ASoC: Intel: Skylake: Use SG allocation for SKL-based firmware load

Resign from ->alloc_dma_buf() and use snd_dma_alloc_pages() directly.
For data i.e.: base firmware binary transfer, make use of SG allocation
to better adapt to memory-limited environment. For BDL descriptor, given
its small size this is not required.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Tested-by: Lukasz Majczak <lma@semihlaf.com>
Link: https://lore.kernel.org/r/20221205085330.857665-7-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>