NXP i.MX RT1064-EVK: Project Skeleton & Toolchain Setup

[alieissa-commits]

• Establish directory layout under NXP/MIMXRT1064-EVK/.
• Write fetch_sdk scripts to download necessary NXP CMSIS and driver sources.
• Configure CMakeLists.txt and arm-gcc-cortex-m7.cmake linking to root libs/threadx.