cpu/arm/k60: Remove old asm startcode.

This is a leftover since e673da1 cpu/arm/k60: Use C startup instead of ASM.

Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>
cpu/arm/k60: Add .ramcode handling to startup code.

Use __attribute__((section (".ramcode"))) to place code in RAM if
needed.

Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>