interfaces: convert broadcom-asic-control to common iface

[zyga]

This patch uses the improved common interface to cut the amount of
boilerplate code that needs to exist in the builtin interfaces packae.

Signed-off-by: Zygmunt Krynicki zygmunt.krynicki@canonical.com

[codecov-io]

Codecov Report

Merging #3662 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3662      +/-   ##
==========================================
- Coverage   75.16%   75.16%   -0.01%     
==========================================
  Files         388      388              
  Lines       33655    33633      -22     
==========================================
- Hits        25298    25280      -18     
+ Misses       6538     6535       -3     
+ Partials     1819     1818       -1

Impacted Files	Coverage Δ
interfaces/builtin/broadcom_asic_control.go	100% <100%> (+8.82%)	⬆️
cmd/snap/cmd_aliases.go	93.33% <0%> (-1.67%)	⬇️
interfaces/builtin/common.go	65.57% <0%> (+3.27%)	⬆️

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[mvo5]

Whats not to like about when things get easier :) Will need a @jdstrand review as well though.