kernel: Use prebuilt binaries

perl, lz4c, and a bunch of other binaries are not allowed anymore.
So we need to provide our own.

Change-Id: Idbc88b76247b3dda7c5d52e5eed2d548c33f6f2d
diff --git a/build/soong/Android.bp b/build/soong/Android.bp
index dc3970d..a666b29 100644
--- a/build/soong/Android.bp
+++ b/build/soong/Android.bp
@@ -27,7 +27,7 @@
     name: "generated_kernel_includes",
 
     // The headers make command
-    cmd: "$(KERNEL_MAKE_CMD) $(KERNEL_MAKE_FLAGS) -C $(TARGET_KERNEL_SOURCE) O=$(genDir) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) headers_install",
+    cmd: "$(PATH_OVERRIDE_SOONG) $(KERNEL_MAKE_CMD) $(KERNEL_MAKE_FLAGS) -C $(TARGET_KERNEL_SOURCE) O=$(genDir) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) headers_install",
 
     // Directories that can be imported by a cc_* module generated_headers property
     export_include_dirs: ["usr/include", "usr/techpack/audio/include"],
diff --git a/build/tasks/kernel.mk b/build/tasks/kernel.mk
index 507c4b0..3ba45a0 100644
--- a/build/tasks/kernel.mk
+++ b/build/tasks/kernel.mk
@@ -187,6 +187,9 @@
     TARGET_KERNEL_MODULES := INSTALLED_KERNEL_MODULES
 endif
 
+# System tools are no longer allowed on 10+
+PATH_OVERRIDE += $(TOOLS_PATH_OVERRIDE)
+
 KERNEL_ADDITIONAL_CONFIG_OUT := $(KERNEL_OUT)/.additional_config
 
 # Internal implementation of make-kernel-target