radix-tree: get source-pkg per the running kernel
Kind reminder: Some of the kernel source can not build radix-tree correctly (e.g v5.9., v5.11.). So parameter KERNEL_GIT_BRANCH will help to choose a preferred version as you like, from my test, v5.10 and v5.12 series works well.
Signed-off-by: Li Wang liwang@redhat.com