android: aco: add aco_ir.cpp to Makefile.sources

android: aco: add aco_ir.cpp to Makefile.sources

Fixes the following building errors:

FAILED: out/target/product/x86_64/obj/SHARED_LIBRARIES/vulkan.radv_intermediates/LINKED/vulkan.radv.so
...
ld.lld: error: undefined symbol: aco::can_use_SDWA(chip_class, std::__1::unique_ptr<aco::Instruction, aco::instr_deleter_functor> const&)
...
ld.lld: error: undefined symbol: aco::can_use_opsel(chip_class, aco_opcode, int, bool)
...
clang-9: error: linker command failed with exit code 1 (use -v to see invocation)

Fixes: d9cfb8ad ("aco: validate instructions reading/writing upper halves/bytes")
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5425>