MIPS: Move FP usage checks into protected_{save, restore}_fp_context

In preparation for sharing protected_{save,restore}_fp_context with
compat ABIs, move the FP usage checks into said functions. This will
both enable that code to be shared, and allow for extensions of it in
further patches to also be shared.

Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: Guenter Roeck <[email protected]>
Cc: Matthew Fortune <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: [email protected]
Cc: Richard Weinberger <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Maciej W. Rozycki <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/10790/
Signed-off-by: Ralf Baechle <[email protected]>

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