switchtec: Make struct event_regs static

The structure event_regs is local to the source and does not need to be in
global scope, so make it static.

Cleans up sparse warning:

  symbol 'event_regs' was not declared. Should it be static
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NLogan Gunthorpe <logang@deltatee.com>

drivers/pci/switch/switchtec.c

@@ -943,7 +943,7 @@ static u32 __iomem *pff_ev_reg(struct switchtec_dev *stdev,
 #define EV_PAR(i, r)[i] = {offsetof(struct part_cfg_regs, r), part_ev_reg}
 #define EV_PFF(i, r)[i] = {offsetof(struct pff_csr_regs, r), pff_ev_reg}
 
-const struct event_reg {
+static const struct event_reg {
 	size_t offset;
 	u32 __iomem *(*map_reg)(struct switchtec_dev *stdev,
 				size_t offset, int index);