networkmanager: Use internal DHCP client implementation

Using external dhclient brings ISC BIND libs into base image
Bind is heavy DNS server with big maintenance cost. We dont
want to ship neither bind nor bind-libs in the images.
Closes #151

Upstream-status: Not applicable

Signed-off-by: Pavel Zhukov <pavel.zhukov@huawei.com>

meta-ohos-core/recipes-connectivity/networkmanager/networkmanager_%.bbappend

@@ -6,3 +6,5 @@ inherit writables
 
 WRITABLES = "system-connections"
 WRITABLE_PATH[system-connections] = "/etc/NetworkManager/system-connections"
+
+PACKAGECONFIG_remove = "dhclient"