add kiss radio env to most of the variants

variants/waveshare_rp2040_lora/platformio.ini

@@ -131,3 +131,8 @@ build_src_filter = ${waveshare_rp2040_lora.build_src_filter}
   +<../examples/simple_secure_chat/main.cpp>
 lib_deps = ${waveshare_rp2040_lora.lib_deps}
   densaugeo/base64 @ ~1.4.0
+
+[env:waveshare_rp2040_lora_kiss_modem]
+extends = waveshare_rp2040_lora
+build_src_filter = ${waveshare_rp2040_lora.build_src_filter}
+  +<../examples/kiss_modem/>