riscv: Rename __switch_to_aux() -> fpu

The name of __switch_to_aux() is not clear and rename it with the
determine function: __switch_to_fpu(). Next we could add other regs'
switch.

Signed-off-by: Guo Ren <[email protected]>
Signed-off-by: Guo Ren <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Reviewed-by: Palmer Dabbelt <[email protected]>
Signed-off-by: Andy Chiu <[email protected]>
Tested-by: Heiko Stuebner <[email protected]>
Reviewed-by: Heiko Stuebner <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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