esp8266: Implement vfs.rom_ioctl with support for external flash.

Not enabled by default on any board.  For a board to enable ROMFS it must:

- Add `#define MICROPY_VFS_ROM (1)` to its `mpconfigboard.h` file.

- Add a FLASH_ROMFS partition to the linker script and expose the partition
  with:

    _micropy_hw_romfs_start = ORIGIN(FLASH_ROMFS);
    _micropy_hw_romfs_size = LENGTH(FLASH_ROMFS);

Signed-off-by: Damien George <damien@micropython.org>

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