boards: rename Quark SE Devboard to Quark SE C1000

This board now has an official name and will be available soon:

http://www.intel.com/content/www/us/en/embedded/products/quark/mcu/se-soc/overview.html



Jira: ZEP-758
Change-Id: Ia16d33722308cf81471321c3063bdc75055a4d50
Signed-off-by: Anas Nashif <anas.nashif@intel.com>