soc: sam4s: added missing devices in sam4s range

added sam4s16b, sam4s8c, sam4s8b, sam4s4c, sam4s4b,
sam4s4a, sam4s2c, sam4s2b and sam4s2a.
Used the same order as in the data sheet and code structure
equal to same70. Updated the sam4s_xplained board to match
the altered .dtsi location of the specific SoC.

Signed-off-by: Vincent van der Locht <vincent@vlotech.nl>