[PATCHv2] [RFC] Xilinx Virtex 4 FX Soft FPU support

[Sergey Temerkhanov]

This patch enables support for Xilinx Virtex 4 FX singe-float FPU.

Changelog v1->v2:
	-Added MSR_AP bit definition
	-Renamed CONFIG_XILINX_FPU to CONFIG_XILINX_SOFTFPU, moved it to 			
	'Platform support' and made it Virtex4-FX-only.
	-Changed SAVE_FPR/REST_FPR definition style.

Caveats: 
	- Hard-float binaries which rely on in-kernel math emulation will give 
wrong results since they expect 64-bit double-precision instead of 32-bit 
single-precision numbers which Xilinx V4-FX Soft FPU produces.

Regards, Sergey Temerkhanov
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