nRF52840: Migrate variants to new structure (#7396)

variants/nrf52840/tracker-t1000-e/platformio.ini

@@ -0,0 +1,22 @@
+[env:tracker-t1000-e]
+extends = nrf52840_base
+board = tracker-t1000-e
+build_flags = ${nrf52840_base.build_flags}
+  -Ivariants/nrf52840/tracker-t1000-e
+  -Isrc/platform/nrf52/softdevice
+  -Isrc/platform/nrf52/softdevice/nrf52
+  -DTRACKER_T1000_E
+  -DGPS_POWER_TOGGLE
+  -DMESHTASTIC_EXCLUDE_ENVIRONMENTAL_SENSOR_EXTERNAL=1
+  -DMESHTASTIC_EXCLUDE_CANNEDMESSAGES=1
+  -DMESHTASTIC_EXCLUDE_SCREEN=1
+  -DMESHTASTIC_EXCLUDE_DETECTIONSENSOR=1
+  -DMESHTASTIC_EXCLUDE_WIFI=1
+board_build.ldscript = src/platform/nrf52/nrf52840_s140_v7.ld
+build_src_filter = ${nrf52_base.build_src_filter} +<../variants/nrf52840/tracker-t1000-e>
+lib_deps = 
+  ${nrf52840_base.lib_deps}
+  https://github.com/meshtastic/QMA6100P_Arduino_Library/archive/14c900b8b2e4feaac5007a7e41e0c1b7f0841136.zip
+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 = nrfutil