wiseconnect: Import Memory Controller files

Origin: Silicon Labs WiSeConnect SDK
License: Zlib
URL: https://github.com/siliconlabs/wiseconnect
Commit: 05ef77e82bb473fdf157d33fb9cbf6e1d9a11a9e
Version: v3.5.0-rc3
Purpose: Add support for Memory Controller / PSRAM

Signed-off-by: Jérôme Pouiller <[email protected]>

Author: jerome-pouiller