mmc: omap_hsmmc: do not embed struct mmc in struct omap_hsmmc_plat

The area for struct mmc can be allocated dynamically. It greatly reduces
the size of struct omap_hsmmc_plat. This is useful in cases where the board
level code declares one or two struct omap_hsmmc_plat because it doesn't
use the Driver Model.

This saves around 740 bytes for the am335x_evm SPL.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Tested-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/include/asm/omap_mmc.h

@@ -67,7 +67,7 @@ struct hsmmc {
 struct omap_hsmmc_plat {
 	struct mmc_config cfg;
 	struct hsmmc *base_addr;
-	struct mmc mmc;
+	struct mmc *mmc;
 	bool cd_inverted;
 	u32 controller_flags;
 	const char *hw_rev;

drivers/mmc/omap_hsmmc.c

@@ -1858,8 +1858,8 @@ static int omap_hsmmc_ofdata_to_platdata(struct udevice *dev)
 static int omap_hsmmc_bind(struct udevice *dev)
 {
 	struct omap_hsmmc_plat *plat = dev_get_platdata(dev);
-
-	return mmc_bind(dev, &plat->mmc, &plat->cfg);
+	plat->mmc = calloc(1, sizeof(struct mmc));
+	return mmc_bind(dev, plat->mmc, &plat->cfg);
 }
 #endif
 static int omap_hsmmc_probe(struct udevice *dev)
@@ -1882,7 +1882,7 @@ static int omap_hsmmc_probe(struct udevice *dev)
 #endif
 
 #ifdef CONFIG_BLK
-	mmc = &plat->mmc;
+	mmc = plat->mmc;
 #else
 	mmc = mmc_create(cfg, priv);
 	if (mmc == NULL)