mmc: read ssr for SD spi

The content of ssr is useful only for erase operations.
This saves erase time.

Signed-off-by: Pragnesh Patel <pragnesh.patel@sifive.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
Tested-by: Bin Meng <bin.meng@windriver.com>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 50f47d4..7b5c55b 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1753,6 +1753,11 @@
 		mmc_set_bus_width(mmc, 1);
 		mmc_select_mode(mmc, MMC_LEGACY);
 		mmc_set_clock(mmc, mmc->tran_speed, MMC_CLK_ENABLE);
+#if CONFIG_IS_ENABLED(MMC_WRITE)
+		err = sd_read_ssr(mmc);
+		if (err)
+			pr_warn("unable to read ssr\n");
+#endif
 		return 0;
 	}