Do not add quotes around flags argument

* build/soong will adds quotes around the whole flags
  and preserve the quotes around flags argument.
  The quotes incorrectly became part of a flag's value,
  and the --header-filter did not select system/apex .h files.
* clang-tidy accepts both --header-filter= and -header-filter=
* allow new found .h file clang-tidy warnings, not as errors.

Bug: 180862582
Test: make; make with WITH_TIDY=1
Change-Id: Ia6a61cbafe520d5611bb03aa8a3e077f7b7cbbb6
1 file changed