qemu: do not allow /dev/rtc or /dev/hpet access via the devices cgroup

The RTC and HPET modes for the QEMU emulation tick have been dropped
almost 9 years ago, in commit 25f3151ece1d5881826232bebccc21b588d4e03e.
Do not allow them in the devices cgroup policy.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

docs/drvqemu.html.in

@@ -484,7 +484,6 @@ chmod o+x /path/to/directory
 /dev/null, /dev/full, /dev/zero,
 /dev/random, /dev/urandom,
 /dev/ptmx, /dev/kvm,
-/dev/rtc, /dev/hpet
 </pre>
 
     <p>

src/qemu/qemu.conf

@@ -495,7 +495,6 @@
 #    "/dev/null", "/dev/full", "/dev/zero",
 #    "/dev/random", "/dev/urandom",
 #    "/dev/ptmx", "/dev/kvm",
-#    "/dev/rtc","/dev/hpet"
 #]
 #
 # RDMA migration requires the following extra files to be added to the list:

src/qemu/qemu_cgroup.c

@@ -47,7 +47,6 @@ const char *const defaultDeviceACL[] = {
     "/dev/null", "/dev/full", "/dev/zero",
     "/dev/random", "/dev/urandom",
     "/dev/ptmx", "/dev/kvm",
-    "/dev/rtc", "/dev/hpet",
     NULL,
 };
 #define DEVICE_PTY_MAJOR 136

src/qemu/test_libvirtd_qemu.aug.in

@@ -61,8 +61,6 @@ module Test_libvirtd_qemu =
     { "5" = "/dev/urandom" }
     { "6" = "/dev/ptmx" }
     { "7" = "/dev/kvm" }
-    { "8" = "/dev/rtc" }
-    { "9" = "/dev/hpet" }
 }
 { "save_image_format" = "raw" }
 { "dump_image_format" = "raw" }