net: ptp: clock: Add usermode support to ptp_clock_get()

It is useful that the ptp_clock_get() function can be called from
the userspace. Create also unit test for calling that function
from userspace.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
diff --git a/scripts/gen_kobject_list.py b/scripts/gen_kobject_list.py
index d4aa54d..8cf04ab 100755
--- a/scripts/gen_kobject_list.py
+++ b/scripts/gen_kobject_list.py
@@ -112,6 +112,7 @@
     "spi_driver_api",
     "uart_driver_api",
     "can_driver_api",
+    "ptp_clock_driver_api",
 ]