automation: enable earlyprintk=xen for both dom0 and domU in hw tests

Make debugging early boot failures easier based on just CI logs.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

automation/scripts/qubes-x86-64.sh

@@ -84,7 +84,7 @@ type = "'${test_variant#pci-}'"
 name = "domU"
 kernel = "/boot/vmlinuz"
 ramdisk = "/boot/initrd-domU"
-extra = "root=/dev/ram0 console=hvc0"
+extra = "root=/dev/ram0 console=hvc0 earlyprintk=xen"
 memory = 512
 vif = [ ]
 disk = [ ]
@@ -190,7 +190,7 @@ CONTROLLER=control@thor.testnet
 
 echo "
 multiboot2 (http)/gitlab-ci/xen $CONSOLE_OPTS loglvl=all guest_loglvl=all dom0_mem=4G $extra_xen_opts
-module2 (http)/gitlab-ci/vmlinuz console=hvc0 root=/dev/ram0
+module2 (http)/gitlab-ci/vmlinuz console=hvc0 root=/dev/ram0 earlyprintk=xen
 module2 (http)/gitlab-ci/initrd-dom0
 " > $TFTP/grub.cfg