Allow 1984K flash to be used on Teensy 4.0

teensy4/imxrt1062.ld

@@ -3,7 +3,7 @@ MEMORY
 	ITCM (rwx):  ORIGIN = 0x00000000, LENGTH = 512K
 	DTCM (rwx):  ORIGIN = 0x20000000, LENGTH = 512K
 	RAM (rwx):   ORIGIN = 0x20200000, LENGTH = 512K
-	FLASH (rwx): ORIGIN = 0x60000000, LENGTH = 1536K
+	FLASH (rwx): ORIGIN = 0x60000000, LENGTH = 1984K
 }
 
 ENTRY(ImageVectorTable)