binder_status.h: include assert.h for __assert

The binder_status.h header is defining __assert as a macro for its own
error reporting, which conflicts with glibc's unused __assert function.
Android's version of glibc 2.17's assert.h has an _ASSERT_H_DECLS guard
macro preventing redeclaration of the __assert function, so if we add
an include of assert.h in binder_status.h, the __assert function can be
declared before the identifier is shadowed by the macro, and later
assert.h inclusions won't redeclare __assert (even though they *do*
redefine assert according to the current value of NDEBUG).

Without this fix, after upgrading libc++, assert.h is incidentally
included somewhere *after* binder_status.h, and binder's __assert
macro is applied to the __assert declaration in the glibc header,
which is invalid syntax.

Bug: 175635923
Test: m art_artd_tests
Change-Id: I35c197b8d92ecad417a7e9950f51461375d3861f