ASoC: Intel: haswell and broadwell boards update

Merge series from Cezary Rojewski <cezary.rojewski@intel.com>:

A number of patches improving overall quality and readability of
haswell.c and broadwell.c source files found in sound/soc/intel/boards.
Both files are first renamed and only then actual changes are being
incrementally added. The respective names are: hsw_rt5640 and bdw_rt286
to match the pattern found in more recent boards.

Most patches bring no functional change - the more impactful patches at
are placed the end.  The last patch is removing of FE DAI ops. Given the
existence of platform FE DAI capabilities (either static declaration or
through topology file), this code is redundant.