adb : add missing connection states

Both CS_RECOVERY and CS_SIDELOAD where not being checked by
connection_state_name which resulted in adb get-state returning
unknown when a device is in those modes.

Change-Id: I00716024d6a0bdb68d6e2380c8cd7b5d056bd15f
Signed-off-by: trevd <trevd1234@gmail.com>
diff --git a/adb/adb.c b/adb/adb.c
index 71b7a8b..cd7f16c 100644
--- a/adb/adb.c
+++ b/adb/adb.c
@@ -401,6 +401,10 @@
         return "bootloader";
     case CS_DEVICE:
         return "device";
+    case CS_RECOVERY:
+        return "recovery";
+    case CS_SIDELOAD:
+        return "sideload";
     case CS_OFFLINE:
         return "offline";
     default: