qcwcn: Add interface_mtu request

Change-Id: Icdefef44e4387b25b3a667c19ba92b71e61df197
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/qcwcn/config/android_dhcpcd.conf b/qcwcn/config/android_dhcpcd.conf
index e6b4414..0fe3996 100644
--- a/qcwcn/config/android_dhcpcd.conf
+++ b/qcwcn/config/android_dhcpcd.conf
@@ -6,4 +6,4 @@
 
 interface wlan0
 # dhcpcd-run-hooks uses these options.
-option subnet_mask, routers, domain_name_servers
+option subnet_mask, routers, domain_name_servers, interface_mtu