ANDROID: 16K: Fix __MAP_NO_COMPAT overflow

do_mmap() expects a 32-bit flag. Use the highest bit to avoid
potential future conflicts from upstream.

Bug: 329210993
Bug: 315325080
Bug: 302403436
Test: tools/bazel run //common-modules/virtual-device:virtual_device_i686_dist
Change-Id: I30c1213a2c640e1d4040c208353239ac3c04fbd2
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>