sparc64: Sync FPU state in VIS emulation handler.

[ Upstream commit 410d2c8187ed969238ba98008c1d57307a56cfd8 ]

Copy the FPU state to the task's thread_info->fpregs for the VIS emulation
functions to access.

Signed-off-by: Hong H. Pham <hong.pham@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>