MFC r272103: Move s3c2xx0 into the samsung directory.

Move the ARM Samsung s3c2xx0 support files into the samsung directory, to
match other platforms.

Discussed with: andrew

Remove STARTUP_PAGETABLE_ADDR from the ARM configs and replace it with
memory at the end of the kernel.

This helps reduce the SoC and board specific configuration required.

Reviewed by: bsdimp
Tested by: jmg (armeb), br

Merging projects/armv6, part 1

Cummulative patch of changes that are not vendor-specific:
- ARMv6 and ARMv7 architecture support
- ARM SMP support
- VFP/Neon support
- ARM Generic Interrupt Controller driver
- Simplification of startup code for all platforms

Move the load address of the kernel to the start of KVA as the
s3c24x0 copy of initarm expects the kernel to be loaded there.

Approved by: imp (mentor)

Add support for the Samsung S3C2xx0 family of ARM SoCs written by
Andrew Turner. The kernel supports the LN2410SBC evaluation board,
and likely others. These parts (or similar ones) are in some open
hardware designs for phones.

Submitted by: Andrew Turner