Create empty monolithic hiddenapi flags files for non java devices.

This is a followup https://r.android.com/3089366 that disabled the
creation of out/soong/hiddenapi/hiddenapi* files for non java device
builds. This works fine for `m`, but `m dist` runs issues since
`f/b/boot/Android.bp` dists these files. For non java devices, the
previous implementation would report missing files during ninja
excecution (https://b.corp.google.com/issues/338363444#comment5)

This CL creates empty files for these so that the dist tags can always
be resolved.

Bug: 338363444
Test: lunch aosp_cf_x86_64_minidroid-trunk_staging-userdebug && m dist
Change-Id: Ice2d970a164246753da89a6a06dfd28a627a272d