arm64/sve: Remove unused declaration read_smcr_features()

Commit 3912084 ("arm64/sve: Remove SMCR pseudo register from cpufeature code")
removed the implementation but leave declaration.

Signed-off-by: Yue Haibing <[email protected]>
Reviewed-by: Mark Brown <[email protected]>
Reviewed-by: Zenghui Yu <[email protected]>
Reviewed-by: Anshuman Khandual <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: Yue Haibing

arch/arm64/include/asm/fpsimd.h

@@ -155,8 +155,6 @@ extern void cpu_enable_sme2(const struct arm64_cpu_capabilities *__unused);
 extern void cpu_enable_fa64(const struct arm64_cpu_capabilities *__unused);
 extern void cpu_enable_fpmr(const struct arm64_cpu_capabilities *__unused);
 
-extern u64 read_smcr_features(void);
-
 /*
  * Helpers to translate bit indices in sve_vq_map to VQ values (and
  * vice versa).  This allows find_next_bit() to be used to find the