[PATCH] mmc: cv1800b: Fix build without MMC_SUPPORTS_TUNING

[Alexander Sverdlin]

That's how it looks like without CONFIG_MMC_SUPPORTS_TUNING before the
patch:

aarch64-buildroot-linux-gnu-ld.bfd: drivers/mmc/cv1800b_sdhci.o: in function `cv1800b_execute_tuning':
drivers/mmc/cv1800b_sdhci.c:47:(.text.cv1800b_execute_tuning+0x50): undefined reference to `mmc_send_tuning'

Signed-off-by: Alexander Sverdlin <alexander.sverdlin at gmail.com>
---
 drivers/mmc/cv1800b_sdhci.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mmc/cv1800b_sdhci.c b/drivers/mmc/cv1800b_sdhci.c
index 4e75051c317..377e6a887df 100644
--- a/drivers/mmc/cv1800b_sdhci.c
+++ b/drivers/mmc/cv1800b_sdhci.c
@@ -31,6 +31,7 @@ static void cv1800b_sdhci_reset(struct sdhci_host *host, u8 mask)
 		udelay(10);
 }
 
+#if CONFIG_IS_ENABLED(MMC_SUPPORTS_TUNING)
 static int cv1800b_execute_tuning(struct mmc *mmc, u8 opcode)
 {
 	struct sdhci_host *host = dev_get_priv(mmc->dev);
@@ -61,9 +62,12 @@ static int cv1800b_execute_tuning(struct mmc *mmc, u8 opcode)
 
 	return 0;
 }
+#endif
 
 const struct sdhci_ops cv1800b_sdhci_sd_ops = {
+#if CONFIG_IS_ENABLED(MMC_SUPPORTS_TUNING)
 	.platform_execute_tuning = cv1800b_execute_tuning,
+#endif
 };
 
 static int cv1800b_sdhci_bind(struct udevice *dev)
-- 
2.49.0