Revert "kernel: fix KERNEL_TOOLCHAIN_PATH_gcc and usage"

This reverts commit 13f4c837feb1b5cba0e6585acf8394ca5431cde8.

Reason for revert: reeet. I broke stuff.

Change-Id: If8518aaa409d9afeaf20c689405fd21900fa5e74
diff --git a/build/tasks/kernel.mk b/build/tasks/kernel.mk
index 8092193..36352a5 100644
--- a/build/tasks/kernel.mk
+++ b/build/tasks/kernel.mk
@@ -188,7 +188,7 @@
     $(error TARGET_KERNEL_MODULES is no longer supported!)
 endif
 
-PATH_OVERRIDE += PATH=$(KERNEL_TOOLCHAIN_PATH_gcc):$$PATH
+PATH_OVERRIDE += PATH=$(KERNEL_TOOLCHAIN_PATH_gcc)/bin:$$PATH
 
 # System tools are no longer allowed on 10+
 PATH_OVERRIDE += $(TOOLS_PATH_OVERRIDE)