drivers: net: remove usage of device_pm_control_nop

device_pm_control_nop is now deprecated in favour of NULL.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index e3946eb..9ee9e50 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -100,7 +100,7 @@
 };
 
 NET_DEVICE_INIT(loopback, "lo",
-		loopback_dev_init, device_pm_control_nop, NULL, NULL,
+		loopback_dev_init, NULL, NULL, NULL,
 		CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
 		&loopback_api, DUMMY_L2,
 		NET_L2_GET_CTX_TYPE(DUMMY_L2), 536);
diff --git a/drivers/net/ppp.c b/drivers/net/ppp.c
index 00019aa..90d2e88 100644
--- a/drivers/net/ppp.c
+++ b/drivers/net/ppp.c
@@ -914,6 +914,6 @@
 };
 
 NET_DEVICE_INIT(ppp, CONFIG_NET_PPP_DRV_NAME, ppp_driver_init,
-		device_pm_control_nop, &ppp_driver_context_data, NULL,
+		NULL, &ppp_driver_context_data, NULL,
 		CONFIG_KERNEL_INIT_PRIORITY_DEFAULT, &ppp_if_api,
 		PPP_L2, NET_L2_GET_CTX_TYPE(PPP_L2), PPP_MTU);
diff --git a/drivers/net/slip.c b/drivers/net/slip.c
index 6157257..dca7900 100644
--- a/drivers/net/slip.c
+++ b/drivers/net/slip.c
@@ -457,7 +457,7 @@
 #define _SLIP_MTU 1500
 
 ETH_NET_DEVICE_INIT(slip, CONFIG_SLIP_DRV_NAME,
-		    slip_init, device_pm_control_nop,
+		    slip_init, NULL,
 		    &slip_context_data, NULL,
 		    CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
 		    &slip_if_api, _SLIP_MTU);
@@ -473,7 +473,7 @@
 #define _SLIP_L2_CTX_TYPE NET_L2_GET_CTX_TYPE(DUMMY_L2)
 #define _SLIP_MTU 576
 
-NET_DEVICE_INIT(slip, CONFIG_SLIP_DRV_NAME, slip_init, device_pm_control_nop,
+NET_DEVICE_INIT(slip, CONFIG_SLIP_DRV_NAME, slip_init, NULL,
 		&slip_context_data, NULL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
 		&slip_if_api, _SLIP_L2_LAYER, _SLIP_L2_CTX_TYPE, _SLIP_MTU);
 #endif