NXP-MCUBootUtility v6.2.0 release note

Features:

1. [RT700] Support boot device connected to secondary XSPI
   [RT700] 支持下载程序进第二个XSPI上连接的启动设备

Bugfixes:

1. [RT700] Fix download error when FDCB area in NOR flash is not blank
   [RT700] 当NOR Flash的FDCB区域非空时，下载可能报错
2. [RT700] Fix support for Non-XIP image when it is linked in secure SRAM
   [RT700] 当待下载程序链接在安全SRAM地址时，下载会报错