MIPS: math-emu: Remove unused handle_dsemul function declaration

handle_dsemul does not exist and it's not being used in the code at all
so remove its declaration. The deliberate DS emulation exception is
handled by the do_dsemulret C code.
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10950/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/math-emu/dsemul.c

@@ -33,7 +33,6 @@ struct emuframe {
 
 int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
 {
-	extern asmlinkage void handle_dsemulret(void);
 	struct emuframe __user *fr;
 	int err;