define used types before their use

Familiarizes the reader with the context of what they're about to get into.

src/hex_boosting.proto

@@ -2,6 +2,14 @@ syntax = "proto3";
 
 package helium;
 
+enum boosted_hex_device_type_v1 {
+  all = 0;
+  cbrs_indoor = 1;
+  cbrs_outdoor = 2;
+  wifi_indoor = 3;
+  wifi_outdoor = 4;
+}
+
 message boosted_hex_info_v1 {
   // The res12 h3 index of the boosted hex
   uint64 location = 1;
@@ -33,11 +41,3 @@ message boosted_hex_update_v1 {
   // Details of the updated hex
   boosted_hex_info_v1 update = 2;
 }
-
-enum boosted_hex_device_type_v1 {
-  all = 0;
-  cbrs_indoor = 1;
-  cbrs_outdoor = 2;
-  wifi_indoor = 3;
-  wifi_outdoor = 4;
-}