New Mtk FlashTool v3.852.0

New FeaturesEnhancements:1. [FOTA] Dual Endmark for lowering assertion ratio while power lossing2. [NAND Driver] 1 bit-tolerance for identifying bad block mark================== FlashTool v3.0848 (2008/11/26) ==================Bug fixes:1. [Memory Verification] Fix a boundary condition issue when external ram size equals to the max size of EMI CS.2. [NFB MBA] If E-NFB is changed, update