kill i386 and x86_64 directories

This series kill the old i386 and x86_64 directories. The relevant files are moved and adapted and Kconfig.debug was consolidated (thanks to Randy).

I had to modify both the top-lvel Makefile and the kconfig Makefile to accomplish this. It was done in such a way that it is trivial for other archs to use the same mechanism should they have the need.

To solve the defconfig issue (i386 and x86_64 cannot share one) the arch/x86/configs/ directory were introduced. This has been used by other archs for some time now but x86 had not had the need until now.

The Kconfig files could be consolidated much more - I only did the minimal changes to make it work in the new place.

Total diffstat (in git format):

 Makefile                                           |    7 ++-
 arch/i386/.gitignore                               |    1 -
 arch/{i386 => x86}/Kconfig.cpu                     |    0 
 arch/{i386 => x86}/Kconfig.debug                   |   51 +++++++++++++---
 arch/{i386/Kconfig => x86/Kconfig.i386}            |    4 +-
 arch/{x86_64/Kconfig => x86/Kconfig.x86_64}        |    6 +--
 arch/x86/Makefile                                  |   16 +++++
 arch/{i386/Makefile => x86/Makefile_32}            |    7 +--
 arch/{i386/Makefile.cpu => x86/Makefile_32.cpu}    |    0 
 arch/{x86_64/Makefile => x86/Makefile_64}          |    5 +-
 .../{i386/defconfig => x86/configs/i386_defconfig} |    0 
 .../defconfig => x86/configs/x86_64_defconfig}     |    0 
 arch/x86_64/.gitignore                             |    1 -
 arch/x86_64/Kconfig.debug                          |   61 --------------------
 scripts/kconfig/Makefile                           |   35 +++++++-----
 15 files changed, 89 insertions(+), 105 deletions(-)

Patches follows.
The full serie can be pulled from:

	git://git.kernel.org/pub/scm/linux/kernel/git/sam/x86.git

Note: The serie were slightly modfied compared to the fist published
version.

Sam