aapt2: use clean-path on paths to resource files

The aapt2 rules need to generate an output path for each resource
file.  Use $(call clean-path) on the input path so the output path
doesn't contain "..".

Bug: 112037828
Test: m checkbuild
Change-Id: Ib4e255e7a7f1d069cd3871a12ac232f231f19646