mmc: Add a saved_clock member

Add a saved_clock member to struct mmc to store the previous clock speed
in the clock needs to be stopped for some time.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/include/mmc.h b/include/mmc.h
index 4bdeb92..8a9ea0b 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -605,6 +605,7 @@
 	bool clk_disable; /* true if the clock can be turned off */
 	uint bus_width;
 	uint clock;
+	uint saved_clock;
 	enum mmc_voltage signal_voltage;
 	uint card_caps;
 	uint host_caps;