Fix enabling extrakey in mk47 config so I can adjust the volume. Ran out of endpoints.

Author: calebeby

keyboards/inland/mk47/keymaps/default/rules.mk

@@ -6,6 +6,7 @@ CONSOLE_ENABLE = no
 NKRO_ENABLE = no
 MIDI_ENABLE = no
 VIRTSER_ENABLE = yes
-EXTRAKEY_ENABLE = no
+EXTRAKEY_ENABLE = yes
+KEYBOARD_SHARED_EP = yes
 
 LINK_TIME_OPTIMIZATION_ENABLE = yes