libmodprobe: Canonicalize module names in ModuleDependencyGraph::GetModule()

This commit makes sure to call CanonicalizeModulePath() in
ModuleDependencyGraph::GetModule(). Some kernel modules with '-' in
their name were requested, where they should have been replaced with
'_', leaving the kernel modules unloaded.

Test: snd-hda-codec-hdmi is loaded
Bug: 441237125
Change-Id: Ieebab51f1ae6e2d1d33e6e0eda1302612d2de52f