hwrng: cavium - make two functions static

Functions cavium_rng_remove and cavium_rng_remove_vf are local to the
source and do not need to be in global scope, so make them static.

Cleans up sparse warnings:
drivers/char/hw_random/cavium-rng-vf.c:80:7: warning: symbol
'cavium_rng_remove_vf' was not declared. Should it be static?
drivers/char/hw_random/cavium-rng.c:65:7: warning: symbol
'cavium_rng_remove' was not declared. Should it be static?
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/cavium-rng-vf.c

@@ -77,7 +77,7 @@ static int cavium_rng_probe_vf(struct	pci_dev		*pdev,
 }
 
 /* Remove the VF */
-void  cavium_rng_remove_vf(struct pci_dev *pdev)
+static void  cavium_rng_remove_vf(struct pci_dev *pdev)
 {
 	struct cavium_rng *rng;
 

drivers/char/hw_random/cavium-rng.c

@@ -62,7 +62,7 @@ static int cavium_rng_probe(struct pci_dev *pdev,
 }
 
 /* Disable VF and RNG Hardware */
-void  cavium_rng_remove(struct pci_dev *pdev)
+static void cavium_rng_remove(struct pci_dev *pdev)
 {
 	struct cavium_rng_pf *rng;