2014/02/22 code comments fix-2

- code comments white space add or delete.
- __pa(MAX_DMA_ADDRESS) address value comment fix to 0x5FFFFFFF
- exynos5420-smdk5420.dtb hex dump file (exynos5420-smdk5420_dtb.txt) add to Reference folder.
Merge branch 'master' of github.com:arm10c/linux into review

* 'master' of github.com:arm10c/linux:
  2014/02/22 code comments fix-2