Revert "Update kernel.mk"

This reverts commit 9a97de2ab3140c58f67d75d4d6b6a9bfbc96bd1f.
Revert "Update kernel.mk"

This reverts commit daa447e17145891f375f7e0e7f2dedf1c3b0360c.
Revert "Update envsetup.sh"

This reverts commit a37fc81e07788a09b7aad20bf441ce1b871afc24.