Make U-Boot restartable and crash dump support

* Added an u8500 board specific ld script. Reserve space for .data
 backup.

* Make a backup copy of initialised data (.data section). If restarted,
  copy the backup data back to .data.

* Create crashkernel env variable dynamically, since it depends on
  U-Boot start address. For dumping U-Boot itself is used as
  crashkernel.

* Set preboot environment variable to checkcrash command, if
  data_init_flag > 0, i.e. we were restarted e.g. by kexec.

* Added crashkernel parameter to common bootargs.
  Decreased environment and pool sizes.

* Changed link address of U-Boot: moved it 32 K up for kdump info to
  0x05608000

* Added "checkcrash" command
  This command checks if there is a pending crash dump
  and writes it to a file on SD/MMC.

ST-Ericsson ID: WP264488

Change-Id: If545822e424b95532f1128afb0e762b6b73834e9
Signed-off-by: Michael Brandt <michael.brandt@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/3011

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