New APIs:
- lx_nor_flash_format(): setup the NOR Flash for a new and fresh filesystem.
- lx_nor_flash_open_extended(): adds a user data pointer that could be passed to the underlying low-level NOR driver.
- lx_nand_flash_open_extended(): adds a user data pointer that could be passed to the underlying low-level NAND driver.
Updated APIs:
- lx_nor_flash_open(): call the lx_nor_flash_open_extended() with a NULL as user data pointer.
- lx_nand_flash_open(): call the lx_nand_flash_open_extended() with a NULL as user data pointer.