[Android] : 1. Refactory for guestloader (consolidation code and removed...

... magic number)

2. Added atags of initrd for android booting at rtsm.
3. Modified zImage's load address 0x40000000 at arndale board for mmc supported.
4. Modified gestloader. Now Guest loader do not need include guest image. Guest loader operates similarly with bootloader. It loaded guest image from sd card. Now Linux kernel uses ram over 256MB. It's on arndale board.
5. Hypervisor's offset is modified (0xA0000000 ->  0xB0000000) by multi-core team. I modified it in advance.
6. Added mct timer initialization at arndale board.
7. Now Hypervisor can support android booting at rtsm and arndale board.
8. Updated README about Flash to arndale board and booting android at rtsm.