RFC : mmc : boot partition is set as a read-write.

[NamJae Jeon <linkinjeon@xxxxxxxxx>]

mmc : boot partition is set as a read-write.

There is a case that user directly update boot partition through mmcblk0boot0,1.
However, the current boot partition is set as a read-only.
I suggest that boot partition is set as a read-write if there is no
reason that it should be read-only.

static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
{
	int ret = 0;

	if (!mmc_card_mmc(card))
		return 0;

	if (card->ext_csd.boot_size) {
		ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT0,
					 card->ext_csd.boot_size >> 9,
					 false,
					 "boot0");
		if (ret)
			return ret;
		ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT1,
					 card->ext_csd.boot_size >> 9,
					 false,
					 "boot1");
		if (ret)
			return ret;
	}
}

Thanks.
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