crypto: cavium - Make cptvf_device_init static

Fix sparse warning:

drivers/crypto/cavium/cpt/cptvf_main.c:644:6:
 warning: symbol 'cptvf_device_init' was not declared. Should it be static?
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/cavium/cpt/cptvf_main.c

@@ -641,7 +641,7 @@ static void cptvf_write_vq_saddr(struct cpt_vf *cptvf, u64 val)
 	cpt_write_csr64(cptvf->reg_base, CPTX_VQX_SADDR(0, 0), vqx_saddr.u);
 }
 
-void cptvf_device_init(struct cpt_vf *cptvf)
+static void cptvf_device_init(struct cpt_vf *cptvf)
 {
 	u64 base_addr = 0;