Add flag to make UEFI run from DRAM or FLASH for FVPs

- By setting the 'ARM_FVP_RUN_NORFLASH' flag at compile time UEFI will
  be linked to run from NOR FLASH0 on FVPs.
- The RAM load location is currently set to 128MB from base of DRAM.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15245 6f19259b-4bc3-4df7-8a09-765794883524