ASAN: set MAXIMUM_OVERDRIVE := true to disable address sanitizer

with respect to BONE_STOCK taking priority.  this reduced my build time by ~20%.

Address sanitizer is a debugging tool that detects memory errors in the program through debugging tools like gdb. It does so
by using an extra instrumentation module llvm pass during compilation and a runtime library that replaces the malloc function
and by inserting frame pointers in the stack.

Output code performance can be effected if a "hot" function that is known to speed up the code gets flagged during the extra
compiler pass but the primary benefit of turning it off is to speed up your build time from clobber. my setup reduced time by
~20%

Change-Id: Ib05148f6a1a0ba5615d40d376d627cc0dbfba788