Add test to open and close with no mmap

Add a test to check that alloc->buffers
is properly initialized when calling
close after open with no mmap.

Bug: 36007193
Test: run binderDriverInterfaceTest
Change-Id: I94af8499e65714b1b09ac063459eacf05504262a
Signed-off-by: Sherry Yang <sherryy@android.com>