adb: switch handle_host_request to string_view.

Test: test_adb.py
Test: test_device.py
Change-Id: Ideae5262a6dff2e27c50f666144d48f874837290
diff --git a/adb/adb.h b/adb/adb.h
index 3a8cb7b..89d7663 100644
--- a/adb/adb.h
+++ b/adb/adb.h
@@ -218,7 +218,7 @@
 #define USB_FFS_ADB_IN USB_FFS_ADB_EP(ep2)
 #endif
 
-bool handle_host_request(const char* service, TransportType type, const char* serial,
+bool handle_host_request(std::string_view service, TransportType type, const char* serial,
                          TransportId transport_id, int reply_fd, asocket* s);
 
 void handle_online(atransport* t);