mmc: unconditionally define mmc_deinit()

We want to replace '#ifdef' by 'if (IS_ENABLED(CONFIG_...))' in our code.
Therefore functions should be defined unconditionally even if they are not
implemented.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/include/mmc.h b/include/mmc.h
index b92e255..244d2dc 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -786,12 +786,7 @@
 int mmc_init(struct mmc *mmc);
 int mmc_send_tuning(struct mmc *mmc, u32 opcode, int *cmd_error);
 int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data);
-
-#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT) || \
-    CONFIG_IS_ENABLED(MMC_HS200_SUPPORT) || \
-    CONFIG_IS_ENABLED(MMC_HS400_SUPPORT)
 int mmc_deinit(struct mmc *mmc);
-#endif
 
 /**
  * mmc_of_parse() - Parse the device tree to get the capabilities of the host