Set LLVM and DTC empty.

kernel_build() now sets LLVM=1 by default. This change drops LLVM=1 so we
can continue using ld.bfd.

kernel_build() now sets DTC by default. This change drops DTC because
we are using a different Python without pylibfdt.

Bug: 236012223
Bug: 164420327
Change-Id: I923545bdb0a579c657d03d928534afc67719ad9a
1 file changed