flash/nor/at91sam3: fixed lock region size

According to the "AT91SAM ARM-based Flash MCU SAM3S Series datasheet"
(http://www.atmel.com/Images/doc11090s.pdf) p. 30 the lock region
size for the at91sam3sd9 family is 32 kbyte.

This fix is only based on the datasheet due to missing hardware.

Change-Id: Ic47b0642e4f11a60de477eaa0167038103b8ff15
Signed-off-by: Ulf Wetzker <ulf.wetzker@eas.iis.fraunhofer.de>
Reviewed-on: http://openocd.zylin.com/1422
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
at91sam3: Added support for at91sam3sd8a and b

This update is untested due to missing hardware.

Change-Id: Ibe286b741ebbb1c8ae0bd3dea4b8f3e12320ab34
Signed-off-by: Ulf Wetzker <ulf.wetzker@eas.iis.fraunhofer.de>
Reviewed-on: http://openocd.zylin.com/1423
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
at91sam3: Added support for at91sam3s8a, b and c

Only the support for at91sam3s8b is tested on real hardware.

Change-Id: I4ce23bc2f6131d9cf3ff1b301ab9e470d20845ab
Signed-off-by: Ulf Wetzker <ulf.wetzker@eas.iis.fraunhofer.de>
Reviewed-on: http://openocd.zylin.com/1424
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>