install_base.sh: Offload Android SDK/tools installation to devlib

FIX

devlib will have necessary support [1] for installing Android tools to
meet LISA requirements. Thus, remove duplicated functionality from
install_base.sh script.

[1] https://github.com/ARM-software/devlib/pull/686



Signed-off-by: Metin Kaya <metin.kaya@arm.com>