powerpc/fpu: Drop cvt_fd() and cvt_df()

Those two functions have been unused since commit identified below.
Drop them.

Fixes: 31bfdb03 ("powerpc: Use instruction emulation infrastructure to handle alignment faults")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d5641ada199b8dd2af16ad00a66084cf974f2704.1596716418.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/processor.h

@@ -439,8 +439,6 @@ extern void flush_instruction_cache(void);
 extern void hard_reset_now(void);
 extern void poweroff_now(void);
 extern int fix_alignment(struct pt_regs *);
-extern void cvt_fd(float *from, double *to);
-extern void cvt_df(double *from, float *to);
 extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
 
 #ifdef CONFIG_PPC64

arch/powerpc/kernel/fpu.S

@@ -134,18 +134,3 @@ _GLOBAL(save_fpu)
 	mffs	fr0
 	stfd	fr0,FPSTATE_FPSCR(r6)
 	blr
-
-/*
- * These are used in the alignment trap handler when emulating
- * single-precision loads and stores.
- */
-
-_GLOBAL(cvt_fd)
-	lfs	0,0(r3)
-	stfd	0,0(r4)
-	blr
-
-_GLOBAL(cvt_df)
-	lfd	0,0(r3)
-	stfs	0,0(r4)
-	blr