opal-ci: qemu: Use the powernv-3.0 branch
This is based off the current development version of Qemu, and
importantly it contains the patch that allows skiboot and Linux to clear
the PCR that we require to boot.
[stewart: use the open-power/qemu.git tree for prosterity]
set -e
set -vx
-git clone --depth=1 -b powernv-2.12 git://github.com/legoater/qemu.git
+git clone --depth=1 -b qemu-powernv-for-skiboot-5 git://github.com/open-power/qemu.git
cd qemu
git submodule update --init dtc
export CC="ccache gcc"
