kernel: Prevent from installing so files into source dir
vdso build could generate so files, avoid installing such so files into kernel
source dir, otherwise the below package QA error might be hit:
ERROR: QA Issue: File '/usr/src/kernel/arch/x86/vdso/vdso64.so' from
linux-yocto was already stripped, this will prevent future
debugging! [already-stripped]
Signed-off-by: Yang Shi <yang.shi@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
