Use local rules for flex/bison

Use local flex and bison rules for the packet parser instead of
depending on the rules in common-mk. Right now, the packet parser is
using a re-entrant parser which can't be used with C++ codegen for flex.
Common-mk maintainers would like the flex code to use C++ codegen since
it is compiling the file as C++.

Bug: 176847216
Tag: #floss
Test: atest --host bluetooth_test_gd
Change-Id: I731adcff7c966543300d2cdf1f87ef2a69b8a211