Fix pico.upload.maximum_size

Even though the RP2040 supports up to 16 MiB of flash, the Pi Pico only has 2 MiB installed.

Author: tttapa

boards.txt

@@ -414,7 +414,7 @@ pico.upload.transport=
 pico.upload.use_1200bps_touch=true
 pico.upload.wait_for_upload_port=false
 pico.upload.native_usb=true
-pico.upload.maximum_size=16777216
+pico.upload.maximum_size=2097152
 pico.upload.maximum_data_size=270336
 
 pico.bootloader.tool=openocd
@@ -530,4 +530,4 @@ nicla_vision.bootloader.tool=openocd
 nicla_vision.bootloader.config=-f target/stm32h7x_dual_bank.cfg
 nicla_vision.bootloader.programmer=-f interface/stlink.cfg
 nicla_vision.bootloader.extra_action.preflash=stm32h7x option_write 0 0x01c 0xb86aaf0
-nicla_vision.bootloader.file=NICLA_VISION/bootloader.elf
+nicla_vision.bootloader.file=NICLA_VISION/bootloader.elf