mmc: mmc_mode_name() is used also when LOGLEVEL >= LOGL_DEBUG

When CONFIG_LOGLEVEL is set to LOGL_DEBUG or higher then linker throws
error about undefined symbol mmc_mode_name(). So compile mmc_mode_name()
also when CONFIG_LOGLEVEL is set to LOGL_DEBUG or higher.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index f6ccd83..8a7d073 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -132,7 +132,7 @@
 }
 #endif
 
-#if CONFIG_IS_ENABLED(MMC_VERBOSE) || defined(DEBUG)
+#if CONFIG_IS_ENABLED(MMC_VERBOSE) || defined(DEBUG) || CONFIG_VAL(LOGLEVEL) >= LOGL_DEBUG
 const char *mmc_mode_name(enum bus_mode mode)
 {
 	static const char *const names[] = {