Merge pull request #3 from kesl/proto2

Prototype 2 - Pyhsical Interrupt Handling
Merge remote-tracking branch 'upstream/master' into proto2
Merge branch 'proto2' of https://github.com/Wonseok/khypervisor into proto2
arndale board supports - make boards/arndale directory - write some file for supporting arndale board
arndale board supports - make boards/arndale directory - write some file for supporting arndale board
Merge branch 'arndale' of https://github.com/Wonseok/khypervisor into arndale
[git submodule test] u-boot-arndale
[test] replace u-boot to u-boot-arndale
[U-BOOT-ARNDALE] support u-boot in secure mode on arndale board

- .gitmodules: u-boot-arndale url
- README.md: add "Testing u-boot on ARNDALE board using git submodule"
merge with wonseok
Merge branch 'arndale' of https://github.com/Wonseok/khypervisor into proto2-temp
merge [U-BOOT-ARNDALE]
Add plat directory that includes board param, soc param, and offset memory of guest, monitor.
Integrate boot.S and board/arndale/boot.S, model.lds.S and board/arndale/model.lds.S.
1. Makefile - handle OBJS common/conditional cases different
2. offsets.cfg -> memmap.cfg
3. PHYS_OFFSET -> PHYS_START. ADD PHYS_SIZE, PHYS_END definition.
Merge pull request #23 from in1004kyu/proto2-arndale

Set macro definition.