tools: remove unused parts from the Makefile
tools: remove unused parts from the Makefile

(cherry picked from commit 56b5525adf5473195f890b2e932f39f0d17fed49)

Cherry picked from https://lisas.de/~adrian/slof/slof.git/

Signed-off-by: Adrian Reber <a1b909ec1cc11cce40c28d3640eab600e582f833@lisas.de>
Signed-off-by: Alexey Kardashevskiy <ac1fc56530d7d037e1ea666f130daca22d72f964@ozlabs.ru>

aik/SLOF,qemu/SLOF,qemu/SLOF,open-power-host-os/slof,aik/SLOF,stefanberger/SLOF-tpm,stefanberger/SLOF-tpm,aik/SLOF,open-power-host-os/slof,open-power-host-os/slof,qemu/SLOF,stefanberger/SLOF-tpm,open-power-host-os/slof