Revert "AndroidKernel.mk: Use Android's prebuilt "make" if available"

Temporarily revert back to the "make" installed on the host/build machine
until the build time increase with Android's prebuilt "make" is analyzed
and resolved.

This reverts commit a947f972.

Change-Id: Ie1be9ca0349ab29a14b00f855965d6247a3f85bb
Signed-off-by: Amit Shekhar <ashekhar@codeaurora.org>
Signed-off-by: David Ng <dave@codeaurora.org>