mmc: core: Remove duplicated definition of mmc_send_ext_csd()

mmc_send_ext_csd() is an exported function used by both the mmc core
and the mmc block layer. Let's remove the local duplicated definition
in the mmc core.
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

drivers/mmc/core/mmc_ops.h

@@ -20,7 +20,6 @@ int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr);
 int mmc_all_send_cid(struct mmc_host *host, u32 *cid);
 int mmc_set_relative_addr(struct mmc_card *card);
 int mmc_send_csd(struct mmc_card *card, u32 *csd);
-int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd);
 int mmc_send_status(struct mmc_card *card, u32 *status);
 int mmc_send_cid(struct mmc_host *host, u32 *cid);
 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp);