convert to at91bootstrap-3.5.x

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Add blank space to the version print message.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Add blank space to the PMECC correctuin failed print message

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Makefile: change the version to "v3.5.2"

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Boot media: save boot media to the backup register

Give the boot media information provided by the romcode through R4 to next
level bootloader.

This information is stored in the second GPBR for sama5d3 family.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>