Add another seeed_xiao_nrf52840_kit build environment for I2C pinout (#8036)

* Update platformio.ini

* Remove some more extraneous lines

variants/nrf52840/seeed_xiao_nrf52840_kit/platformio.ini

@@ -16,3 +16,11 @@ lib_deps =
 debug_tool = jlink
 ; If not set we will default to uploading over serial (first it forces bootloader entry by talking 1200bps to cdcacm)
 ;upload_protocol = jlink
+
+; Seeed Xiao BLE but with GPS undefined, and therefore i2c active
+[env:seeed_xiao_nrf52840_kit_i2c]
+extends = env:seeed_xiao_nrf52840_kit
+board_level = extra
+build_flags = ${env:seeed_xiao_nrf52840_kit.build_flags}
+  -DSEEED_XIAO_NRF52840_KIT
+build_unflags = -DGPS_L76K