Update all nRF52840 boards to match linker

See commit 583ad02a

increase sd attribute table size from 0x800 to 0xC00,
increase linker memory for SD 840 from 3400 to 6000

Since the linker is updated, all nRF52840 boards using
that linker file should also be updated.

Author: henrygab

boards.txt

@@ -298,7 +298,7 @@ cluenrf52840.upload.protocol=nrfutil
 cluenrf52840.upload.use_1200bps_touch=true
 cluenrf52840.upload.wait_for_upload_port=true
 cluenrf52840.upload.maximum_size=815104
-cluenrf52840.upload.maximum_data_size=248832
+cluenrf52840.upload.maximum_data_size=237568
 
 # Build
 cluenrf52840.build.mcu=cortex-m4
@@ -457,7 +457,7 @@ particle_xenon.upload.protocol=nrfutil
 particle_xenon.upload.use_1200bps_touch=true
 particle_xenon.upload.wait_for_upload_port=true
 particle_xenon.upload.maximum_size=815104
-particle_xenon.upload.maximum_data_size=248832
+particle_xenon.upload.maximum_data_size=237568
 
 # Build
 particle_xenon.build.mcu=cortex-m4
@@ -510,7 +510,7 @@ mdbt50qrx.upload.protocol=nrfutil
 mdbt50qrx.upload.use_1200bps_touch=true
 mdbt50qrx.upload.wait_for_upload_port=true
 mdbt50qrx.upload.maximum_size=815104
-mdbt50qrx.upload.maximum_data_size=248832
+mdbt50qrx.upload.maximum_data_size=237568
 
 # Build
 mdbt50qrx.build.mcu=cortex-m4