Wrong flash size for STM32F412xE

[newbrain]

While adding an STM32F411xx target, and using some "inspiration" (Ctrl-C Ctrl-V) from the STM32F412xx one, I noticed the following:

pyOCD/pyocd/target/builtin/target_STM32F412xx.py

Lines 64 to 80 in b0ab779

	class STM32F412xE(CoreSightTarget):
	VENDOR = "STMicroelectronics"
	MEMORY_MAP = MemoryMap(
	FlashRegion( start=0x08000000, length=0x10000, sector_size=0x4000,
	page_size=0x1000,
	is_boot_memory=True,
	algo=FLASH_ALGO),
	FlashRegion( start=0x08010000, length=0x10000, sector_size=0x10000,
	page_size=0x1000,
	algo=FLASH_ALGO),
	FlashRegion( start=0x08020000, length=0x20000, sector_size=0x20000,
	page_size=0x1000,
	algo=FLASH_ALGO),
	RamRegion( start=0x20000000, length=0x40000)
	)

At line 76 the third flash region is given a size of 0x20000, with base 0x08020000, for a total of 0x40000 B = 256 KiB.
The STM32F4xxxE parts, including the F412, have a 512 KiB flash.
The length param should be 0x60000, giving three sectors of 128 KiB each.