gn2bp: Remove arch suffix from the genrule

This CL makes gn2bp ignore the arch difference in genrule and breaks the
build.
Next CL fixes this by properly merging arch specific cmd for cc_genrule.
Splitting CL to make the Android.bp.swp diff in the next CL readable.

Test: ./update_results.sh
Change-Id: I2d74e91cab5782a3ce9de51a0fa0c9c5c21bf8bf
2 files changed