[U-Boot] [PATCH v2 0/5] Add boot from NAND/eSDHC/eSPI support

[Mingkai Hu]

These patches implement boot from NAND/eSDHC/eSPI in a unified way - all of
these use the general file cpu/mpc85xx/start.S and load the image into L2SRAM.

Modification over v1:
 - Align to the latest tree: http://git.denx.de/u-boot-mpc85xx.git
 - Align the NAND board make config to the latest mkconfig mofication 
 - Split the "save env variables to SDCard" patches to another patchset,
   so patch 4 doesn't depend on that patchset.
 - Some cleanup work

The general modification for 85xx platform:
[PATCH v2 1/5] 85xx: add boot from NAND/eSDHC/eSPI support

Add support for boot from NAND:
[PATCH v2 2/5] NAND boot: change NAND loader's relocate SP to CONFIG param
[PATCH v2 3/5] NAND boot: MPC8536DS support

Add support for boot from eSDHC and eSPI:
[PATCH v2 4/5] On-chip ROM boot: MPC8536DS support

[PATCH v2 5/5] Add README.mpc8536ds