mmc: rename mmc_can_sleep() to mmc_card_can_sleep()

mmc_can_* functions sometimes relate to the card and sometimes to the host.
Make it obvious by renaming this function to include 'card'. Also, convert to
proper bool type while we are here.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20250401095847.29271-9-wsa+renesas@sang-engineering.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: Wolfram Sang

drivers/mmc/core/mmc.c

@@ -1955,7 +1955,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	return err;
 }
 
-static int mmc_can_sleep(struct mmc_card *card)
+static bool mmc_card_can_sleep(struct mmc_card *card)
 {
 	return card->ext_csd.rev >= 3;
 }
@@ -2139,7 +2139,7 @@ static int _mmc_suspend(struct mmc_host *host, enum mmc_poweroff_type pm_type)
 	if (mmc_card_can_poweroff_notify(host->card) &&
 	    mmc_host_can_poweroff_notify(host, pm_type))
 		err = mmc_poweroff_notify(host->card, notify_type);
-	else if (mmc_can_sleep(host->card))
+	else if (mmc_card_can_sleep(host->card))
 		err = mmc_sleep(host);
 	else if (!mmc_host_is_spi(host))
 		err = mmc_deselect_cards(host);