ARM: EXYNOS: no more support non-DT for EXYNOS SoCs

ARM: EXYNOS: no more support non-DT for EXYNOS SoCs

As we discussed in mailing list, non-DT for EXYNOS SoCs will not be
supported from v3.11. This patch removes regarding files for non-DT
including board files and defconfig.

Cc: Sylwester Nawrocki <[email protected]>
Cc: Tomasz Figa <[email protected]>
Cc: Thomas Abraham <[email protected]>
Cc: Kyungmin Park <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Olof Johansson <[email protected]>
Signed-off-by: Kukjin Kim <[email protected]>