add kiss radio env to most of the variants

variants/lilygo_tbeam_SX1276/platformio.ini

@@ -131,3 +131,8 @@ build_src_filter = ${LilyGo_TBeam_SX1276.build_src_filter}
 lib_deps =
   ${LilyGo_TBeam_SX1276.lib_deps}
   ${esp32_ota.lib_deps}
+
+[env:Tbeam_SX1276_kiss_modem]
+extends = LilyGo_TBeam_SX1276
+build_src_filter = ${LilyGo_TBeam_SX1276.build_src_filter}
+  +<../examples/kiss_modem/>