mmc: dw_mmc: Add sdio power bindings

Add dt-based retrieval of host sdio pm capabilities. Based on
the dt based discovery do a bus init in the resume function.

Signed-off-by: Olof Johansson <olofj@chromium.org>
Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
index a5498dc..34be4f4 100644
--- a/include/linux/mmc/dw_mmc.h
+++ b/include/linux/mmc/dw_mmc.h
@@ -231,6 +231,7 @@
 
 	u32 caps;	/* Capabilities */
 	u32 caps2;	/* More capabilities */
+	u32 pm_caps;	/* PM capabilities */
 	/*
 	 * Override fifo depth. If 0, autodetect it from the FIFOTH register,
 	 * but note that this may not be reliable after a bootloader has used