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.

Signed-off-by: Joel Stanley <joel@jms.id.au>
[stewart: use the open-power/qemu.git tree for prosterity]
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

opal-ci/build-qemu-powernv.sh

@@ -2,7 +2,7 @@
 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"