This supports a more consistent property across modules for specifying a
subdirectory to install a file into for prebuilt_etc modules.
Updates bpfix to rewrite `sub_dir` to `relative_install_path`.
Test: gotest prebuilt_etc_test
Test: gotest bpfix_test
Bug: 156568187
Change-Id: Idd05cd2178c46e290764a3b708faa8275818ca1e
prebuilt_dsp soong module allows to install DSP related file to
<partition>/etc/dsp directory. If soc_specific property is enabled
to true, it is then installed to <partition>/dsp directory for
vendor image.
Bug: b/157259542
Test: Wrote unit test cases.
Change-Id: I15431a14bf399338a00835718dfe29544be02e34
Give prebuilt_etc and sh_binary their own packages and split the
gigantic main Android.bp up to small, per-package ones.
Test: m nothing, TreeHugger
Bug: 156980228
Change-Id: I7b00cd344b9f16861f1ff39edf0029f016b853d0
