arch/arm: arm926 may have VFP

The VFP9-S FPU (VFPv2) is optional for ARM926EJ-S, see:
http://www.arm.com/products/processors/classic/arm9/arm926.php?tab=Specifications+
Real silicon:
http://www.nxp.com/documents/data_sheet/LPC3180.pdf



Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>