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>