Revert in order to merge tmk/Robutest patches step by step.

Revert "Merge from https://github.com/robutest/uclinux.git"
This reverts commit 3e597b9ed5dea598f4607820dc6d30f4fb530958.
Add support of ROM based MTD for uClinux.
Define XIP_VIRT_ADDR for MMUless.
To parse U-Boot bootargs for STM32F429I Discovery platform.
During startup, relocate sections that are required to be in RAM.

XIP: Relocate data and bss section from ROM to RAM.
ROMFS: Relocate romfs from ROM to RAM.
Add scripts to make U-Boot images.