mmc: core: make mmc_interrupt_hpi() static

Fix the following sparse warning:

drivers/mmc/core/mmc_ops.c:881:5: warning: symbol 'mmc_interrupt_hpi'
was not declared. Should it be static?

Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Jason Yan <[e-mail]>
Fixes: 55c2b8b9a383 ("mmc: core: Re-work the code for eMMC sanitize")
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/core/mmc_ops.c

···
  *	Issued High Priority Interrupt, and check for card status
  *	until out-of prg-state.
  */
-int mmc_interrupt_hpi(struct mmc_card *card)
+static int mmc_interrupt_hpi(struct mmc_card *card)
 {
 	int err;
 	u32 status;