vmtest: add virtio-rng and cgroup Kconfig options

We're seeing some hangs waiting for entropy when running tests, so let's
enable the virtio-rng module. While we're doing a rebuild, we might as
well enable cgroups so that we can finally run those tests.

Signed-off-by: Omar Sandoval <osandov@osandov.com>

vmtest/kbuild.py

@@ -23,7 +23,7 @@
 
 logger = logging.getLogger(__name__)
 
-KERNEL_LOCALVERSION = "-vmtest5"
+KERNEL_LOCALVERSION = "-vmtest6"
 
 
 def kconfig() -> str:
@@ -59,6 +59,8 @@ def kconfig() -> str:
 CONFIG_TMPFS_XATTR=y
 CONFIG_VIRTIO_CONSOLE=y
 CONFIG_VIRTIO_PCI=y
+CONFIG_HW_RANDOM=m
+CONFIG_HW_RANDOM_VIRTIO=m
 
 # drgn needs /proc/kcore for live debugging.
 CONFIG_PROC_KCORE=y
@@ -79,6 +81,9 @@ def kconfig() -> str:
 # For block tests.
 CONFIG_BLK_DEV_LOOP=m
 
+# For cgroup tests.
+CONFIG_CGROUPS=y
+
 # For kconfig tests.
 CONFIG_IKCONFIG=m
 CONFIG_IKCONFIG_PROC=y