scsi: bfa: Staticify non-external functions

Fixes the following W=1 kernel build warning(s):

drivers/scsi/bfa/bfa_ioc.c:5023:1: warning: no previous prototype for ‘bfa_diag_intr’ [-Wmissing-prototypes]
5023 | bfa_diag_intr(void *diagarg, struct bfi_mbmsg_s *msg)
| ^~~~~~~~~~~~~
drivers/scsi/bfa/bfa_ioc.c:6966:1: warning: no previous prototype for ‘bfa_flash_sem_get’ [-Wmissing-prototypes]
6966 | bfa_flash_sem_get(void __iomem *bar)
| ^~~~~~~~~~~~~~~~~
drivers/scsi/bfa/bfa_ioc.c:6979:1: warning: no previous prototype for ‘bfa_flash_sem_put’ [-Wmissing-prototypes]
6979 | bfa_flash_sem_put(void __iomem *bar)
| ^~~~~~~~~~~~~~~~~

Link: https://lore.kernel.org/r/[e-mail]
Cc: Anil Gurumurthy <[e-mail]>
Cc: Sudarsana Kalluru <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/bfa/bfa_ioc.c

···
 /*
  *	Diag hmbox handler
  */
-void
+static void
 bfa_diag_intr(void *diagarg, struct bfi_mbmsg_s *msg)
 {
 	struct bfa_diag_s *diag = diagarg;
···
 
 }
 
-bfa_status_t
+static bfa_status_t
 bfa_flash_sem_get(void __iomem *bar)
 {
 	u32 n = FLASH_BLOCKING_OP_MAX;
···
 	return BFA_STATUS_OK;
 }
 
-void
+static void
 bfa_flash_sem_put(void __iomem *bar)
 {
 	writel(0, (bar + FLASH_SEM_LOCK_REG));