BUILD_NUMBER and BUILD_HOSTNAME doesn't affect kati regeneration

* Extract BUILD_NUMBER, BUILD_HOSTNAME to file to avoid kati change
* Handle FILE_NAME_TAG_PLACEHOLDER string in dist in build/make/packaging/distdir.mk

Test: check if kati isn't invoked even though BUILD_NUMBER, BUILD_HOSTNAME
  is changed
Test: m && m, and check if the second m is no-op
Bug: 278060169
Change-Id: I65eefc6bb86d4076098a1bf8b317b4cb88201499