This reverts commit 9830fcd6.

The ARM dt support has not been merged yet; this documentation update
was premature.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

v3: added details to Documentation/arm/Booting
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

32 and 64 bit powerpc support has been merged for a while now, but
the booting-without-of.txt document still describes 32 bit as not
supporting multiplatform, which is no longer true.  This patch fixes
the documentation.

Also remove references to powerpc-specific details outside of section
I in preparation to add details for other architectures.

v3: cleaned up a lot more powerpc-isms and updated text to reflect current
    usage conventions.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

The device tree is used by more than just PowerPC.  Make the documentation
directory available to all.

v2: reorganized files while moving to create arch and driver specific
    directories.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Acked-by: NJosh Boyer <jwboyer@linux.vnet.ibm.com>