mmc: mmc_spi: Generate R1 response for erase block start and end address

Erase block start address (CMD32) and erase block end address (CMD33)
command will generate R1 response for mmc SPI mode.

R1 response is 1 byte long for mmc SPI, so assign 1 byte as a response
for this commands.

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_spi.c b/drivers/mmc/mmc_spi.c
index ee56de3..96a4107 100644
--- a/drivers/mmc/mmc_spi.c
+++ b/drivers/mmc/mmc_spi.c
@@ -309,6 +309,8 @@
 	case MMC_CMD_WRITE_SINGLE_BLOCK:
 	case MMC_CMD_WRITE_MULTIPLE_BLOCK:
 	case MMC_CMD_APP_CMD:
+	case SD_CMD_ERASE_WR_BLK_START:
+	case SD_CMD_ERASE_WR_BLK_END:
 		resp = &resp8;
 		resp_size = sizeof(resp8);
 		break;