Add explicit dependency on libbase

The upcoming compiler update will start emitting error for the missing
definition for libbase symbols.

ld.lld: error: undefined symbol: android::base::GetProperty(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)
>>> referenced by ashmem-dev.cpp:128 (system/core/libcutils/ashmem-dev.cpp:128)
>>>               ashmem-dev.o:(__has_memfd_support()) in archive out/soong/.intermediates/system/core/libcutils/libcutils/android_arm64_armv8-a_cortex-a73_core_static/libcutils.a

ld.lld: error: undefined symbol: android::base::GetBoolProperty(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, bool)
>>> referenced by ashmem-dev.cpp:183 (system/core/libcutils/ashmem-dev.cpp:183)
>>>               ashmem-dev.o:(__has_memfd_support()) in archive out/soong/.intermediates/system/core/libcutils/libcutils/android_arm64_armv8-a_cortex-a73_core_static/libcutils.a
clang-9: error: linker command failed with exit code 1 (use -v to see invocation)

Test: make with Clang r365631
Bug: 131328001
Change-Id: I397dc094a0e4f134e052dc671622b94e48499f2f