Refill example lists - all current Ethernet boards

Remove check for LWIP - check target flagging for EMAC drivers.
Should still be DEVICE_EMAC, but tooling doesn't support that.

Author: kjbracey

tools/test/examples/examples.json

@@ -80,10 +80,9 @@
           "https://os.mbed.com/teams/mbed-os-examples/code/mbed-os-example-client"
       ],
       "test-repo-source": "github",
-      "features" : ["LWIP"],
-      "targets" : ["K64F", "K66F", "NUCLEO_F207ZG", "NUCLEO_F429ZI", "NUCLEO_F439ZI",
-                   "NUCLEO_F746ZG", "NUCLEO_F756ZG", "NUCLEO_F767ZI", "DISCO_F746NG",
-                   "DISCO_F769NI", "UBLOX_EVK_ODIN_W2", "UBLOX_C030"],
+      "features" : [],
+      "targets" : ["Freescale_EMAC", "NUVOTON_EMAC", "NXP_EMAC", "RZ_A1_EMAC",
+                   "STM_EMAC"],
       "toolchains" : [],
       "exporters": [],
       "compile" : false,
@@ -96,10 +95,9 @@
       "mbed": [
       ],
       "test-repo-source": "github",
-      "features" : ["LWIP"],
-      "targets" : ["K64F", "K66F", "NUCLEO_F207ZG", "NUCLEO_F429ZI", "NUCLEO_F439ZI",
-                   "NUCLEO_F746ZG", "NUCLEO_F756ZG", "NUCLEO_F767ZI", "DISCO_F746NG",
-                   "DISCO_F769NI", "UBLOX_EVK_ODIN_W2", "UBLOX_C030"],
+      "features" : [],
+      "targets" : ["Freescale_EMAC", "NUVOTON_EMAC", "NXP_EMAC", "RZ_A1_EMAC",
+                   "STM_EMAC"],
       "toolchains" : [],
       "exporters": [],
       "compile" : true,