Update Buildroot rootfs, added modprobe

Update the prebuilt of rootfs.ext4 used in QEMU environment. It was
rebuilt with kmod and kmod_tools included in the image, thus now having
/sbin/modprobe needed by kselftests.

Bug: 193407077
Test: make test
Change-Id: Ie16bce7a97aff59903df6d50149a10fbaf78afdf
1 file changed
tree: 63b21c1b4ba34b4630de3db5aa26c0301c29a4f9
  1. linux-aarch64/
  2. linux-x86/
  3. README