kleaf: switch to generic label_flags To allow for this project to be shared by multiple devices, let's switch to generic labels for the kernel_build, SoC module, and SoC headers. The flags are defined by the specific flags in their top-level bazel build file. Bug: 257343887 Change-Id: I5198c9eb96684da070fc3cc0b1b87366146ee419 Signed-off-by: Will McVicker <[email protected]>