mmc: don't read the size of eMMC enhanced user data area in SPL

This information is only used by the "mmc info" command.
On ARM removing this information from SPL saves about 140 of code space.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 3930aad..c1ba57f 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -2028,6 +2028,7 @@
 		mmc->capacity_gp[i] <<= 19;
 	}
 
+#ifndef CONFIG_SPL_BUILD
 	if (part_completed) {
 		mmc->enh_user_size =
 			(ext_csd[EXT_CSD_ENH_SIZE_MULT + 2] << 16) +
@@ -2044,6 +2045,7 @@
 		if (mmc->high_capacity)
 			mmc->enh_user_start <<= 9;
 	}
+#endif
 
 	/*
 	 * Host needs to enable ERASE_GRP_DEF bit if device is