- Pin configuration is a complete iomux register now and includes
  drive strength, pull mode, mux mode, speed, etc.
- Add i2c devices to the tree
- Add IPG clock
In puthdr(), start the ELF .data section on a new page, as this is
what btxldr expects (.set MEM_DATA,start+0x1000 in btxldr.S).

This makes resulting ELF binaries bootable with grub, gptboot and boot2.

PR:		153801
Submitted by:	Gleb Kurtsou <gleb.kurtsou at gmail.com>
Tested by:	Ruben Kerkhof <ruben at rubenkerkhof.com>
Glanced at by:	jhb, peter
MFC after:	1 month