Makefile: Remove U-boot rules

Building u-boot in the android-kvm repo is deprecated (we use the AOSP
build scripts now), so remove the redundant build rules.

Test: make test
Change-Id: I006c7c6d8927867489cd1615dfe5ed78babd45a9
1 file changed
tree: 8165949b741f712db6f83a7990aec98df3c841c0
  1. aarch64/
  2. crosvm/
  3. cuttlefish/
  4. kvm-unit-tests/
  5. common.inc
  6. Makefile