Add support for CONFIG_S3C_ADDR_BASE

Base address for S3C SFR differs between Samsung config and hardcoded AOSP value. This allows
configuring the value to match whichever is determined to be correct.
Remove unused arch files

Exynos is currently based on ARM, so we don't need x86, ia64, sparc, etc.
Removed extraneous defconfigs

Only concerned with exynos, remove other defconfigs
Add support for Melfas MMS152 touchscreen with apparent Samsung-specific code.

Samsung kernel differentiates between Melfas MMS screens, the MMS152 screen, and the MMS152 screen as
used in the Galaxy Note. Add the files and config options for that last screen.