build_memory_info: Drop support for old FLASH region name

This led to incorrect results about free memory in the stm and i.mx ports

Author: jepler

tools/build_memory_info.py

@@ -52,7 +52,7 @@
 with open(sys.argv[1], "r") as f:
     for line in f:
         line = line.strip()
-        if line.startswith(("FLASH_FIRMWARE", "FLASH", "RAM")):
+        if line.startswith(("FLASH_FIRMWARE", "RAM")):
             regions[line.split()[0]] = line.split("=")[-1]
 
 for region in regions:
@@ -63,11 +63,7 @@
     space = M_PATTERN.sub(M_REPLACE, space)
     regions[region] = int(eval(space))
 
-# TODO Remove check for both FLASH_FIRMWARE and FLASH after all ports are converted to use FLASH_FIRMWARE.
-try:
-    firmware_region = regions["FLASH_FIRMWARE"]
-except KeyError:
-    firmware_region = regions["FLASH"]
+firmware_region = regions["FLASH_FIRMWARE"]
 ram_region = regions["RAM"]
 
 free_flash = firmware_region - text - data