Update boards.txt

PR for issue https://github.com/rogerclarkmelbourne/Arduino_STM32/issues/200

- replaced `upload.flash.maximum_size` and `upload.ram.maximum_size` by the new arduino standard `upload.maximum_size` and `upload.maximum_data_size`
- corrected Flash and Ram value
- Tested by builded every MCU on every Variant

STM32F4/boards.txt

@@ -8,9 +8,8 @@ discovery_f407.upload.protocol=stlink
 
 #discovery_f407.upload.use_1200bps_touch=false
 discovery_f407.upload.file_type=bin
-discovery_f407.upload.ram.maximum_size=17000
-discovery_f407.upload.flash.maximum_size=1048576
 discovery_f407.upload.maximum_size=1048576
+discovery_f407.upload.maximum_data_size=196608
 
 #discovery_f407.upload.usbID=1EAF:0003
 #discovery_f407.upload.altID=1
@@ -37,9 +36,8 @@ stm32f4stamp.upload.protocol=maple_dfu
 
 #stm32f4stamp.upload.use_1200bps_touch=false
 stm32f4stamp.upload.file_type=bin
-stm32f4stamp.upload.ram.maximum_size=196608
-stm32f4stamp.upload.flash.maximum_size=1048576
 stm32f4stamp.upload.maximum_size=1048576
+stm32f4stamp.upload.maximum_data_size=196608
 
 stm32f4stamp.upload.usbID=0483:df11
 stm32f4stamp.upload.altID=0
@@ -67,9 +65,8 @@ netduino2plus.upload.protocol=maple_dfu
 
 #netduino2plus.upload.use_1200bps_touch=false
 netduino2plus.upload.file_type=bin
-netduino2plus.upload.ram.maximum_size=196608
-netduino2plus.upload.flash.maximum_size=1048576
 netduino2plus.upload.maximum_size=1048576
+netduino2plus.upload.maximum_data_size=196608
 
 netduino2plus.upload.usbID=0483:df11
 netduino2plus.upload.altID=0