Revert "Revert "kernel: fix KERNEL_TOOLCHAIN_PATH_gcc and usage""

The fix was correct...

This reverts commit 168fd231b65f3bd575529984f552354f4c5e3e8b.

Change-Id: If550fd44f32b801553b8ac23cb2a91d3f29df557
diff --git a/config/BoardConfigKernel.mk b/config/BoardConfigKernel.mk
index c58d274..ef03b01 100644
--- a/config/BoardConfigKernel.mk
+++ b/config/BoardConfigKernel.mk
@@ -83,7 +83,7 @@
 
 # We need to add GCC toolchain to the path no matter what
 # for tools like `as`
-KERNEL_TOOLCHAIN_PATH_gcc := $(KERNEL_TOOLCHAIN_$(KERNEL_ARCH))/$(KERNEL_TOOLCHAIN_PREFIX_$(KERNEL_ARCH))
+KERNEL_TOOLCHAIN_PATH_gcc := $(KERNEL_TOOLCHAIN_$(KERNEL_ARCH))
 
 ifneq ($(USE_CCACHE),)
     ifneq ($(CCACHE_EXEC),)