emulator: add check_emu_boot.mk, again

"make check_emu_boot" will boot up emulator
and check whether it boots up or timed out.
On boot success, it will emit a file
BOOT_SUCCESS.txt in dist_dir;
On timed out, it will emit a file
BOOT_FAIL.txt in dist_dir

original cl breaks some build, and this
fixes it by incorporating the following cl

https://android-review.googlesource.com/c/platform/build/+/576282

Test: choosecombo 1 aosp_arm64_ab userdebug
      m -j checkbuild tests

Test: make check_emu_boot
Change-Id: I09cba4f8fde672f9ea685dee1c0c108f2c457e2a