[En-Nut-Discussion] [r5282] Added context_fpu.c for cm3

[Michael Fischer]

Hello Uwe,

 >>From the the ARM documentation I understand that fpscr is automatically
 >saved together with s0-s15 due to lazy floating-point state preservation. So
 >your handling of fpscr is superfluous.

I would like to use the fpscr register too. Here it is possible to
set a special value if needed by the setup of switch frame.

Best regards,
Michael