[Revised] How to use SP Flash tool to flash Mediatek firmware

Specifically designed for MediaTek's architecture, it allows tools to communicate with the device in "Download" or "Firmware Upgrade" modes.

(also known as the MediaTek Helio G80 or G85) scatter file is a critical text configuration used by the SP Flash Tool

- partition_index: SYS7 partition_name: system file_name: system.img is_download: true type: EXT4_IMG linear_start_addr: 0x16880800 physical_start_addr: 0x16880800 partition_size: 0x64000000 region: EMMC_USER storage: HW_STORAGE_EMMC boundary_check: true is_reserved: false operation_type: UPDATE d_type: FALSE reserve: 0x00