To allow genrules with more than one tool, rename the tool property to
tools and make it an array, replace $tool with $(location <label>),
and use $() for other variables for consistency.
Bug: 31948427
Test: compare build.ninja
Change-Id: I3d714f70a2af0dc60faeee10e09b6ed166601f1d
Create basic implementation that passes commands
through to the old HAL implementation.
Bug: 31864052
Test: Ran and compared output to old implementation
Change-Id: I01f4450dc3a1893e13b8fb325ea40cf9c98297be
Signed-off-by: Connor O'Brien <connoro@google.com>