OTA
L 版本OTA
build diff OTA升级的步骤如下：
1、new整个project。
2、Step1: ./vendor/mediatek/proprietary/scripts/sign-modem/sign_modem.sh
Step2: ./vendor/mediatek/proprietary/scripts/sign-image/sign_image.sh
3、make otapackage
4、產生差分包： MTK_SECURITY_SW_SUPPORT=yes ./build/tools/releasetools/ota_from_target_files --block -k <key_path> -i old.zip new.zip update.zip
build full OTA升级的步骤如下：
1、new整个project。
2、Step1: ./vendor/mediatek/proprietary/scripts/sign-modem/sign_modem.sh
Step2: ./vendor/mediatek/proprietary/scripts/sign-image/sign_image.sh
3、make otapackage