commonlib/storage/sdhci.c: Remove "ERROR: " from log message

It is no longer necessary to explicitly add "ERROR: " in front of
BIOS_ERR message.

Change-Id: I36e2785ae567d82339212140c1bde0876dfd450d
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69622
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

src/commonlib/storage/sdhci.c

@@ -320,8 +320,7 @@ static int sdhci_send_command(struct sd_mmc_ctrlr *ctrlr,
 		if (!dma_coherent(buf)) {
 			bbstate = &bbstate_val;
 			if (bounce_buffer_start(bbstate, buf, len, bbflags)) {
-				sdhc_error(
-					"ERROR: Failed to get bounce buffer.\n");
+				sdhc_error("Failed to get bounce buffer.\n");
 				return -1;
 			}
 		}