mmc: tmio: use MMC_CAP2_NO_WRITE_PROTECT instead of TMIO own flag

TMIO_MMC_WRPROTECT_DISABLE is equivalent to MMC_CAP2_NO_WRITE_PROTECT.

Only the difference is the TMIO_... makes tmio_mmc_get_ro() return 0
(i.e. it does not affect mmc_gpio_get_ro() at all), while MMC_CAP2_...
returns 0 before calling ->get_ro() hook (i.e. it affects both IP own
logic and GPIO detection).

The TMIO MMC drivers do not set-up gpio_ro by themselves.  Only the
possibility, if any, would be DT specifies "wp-gpios" property, and
gpio_ro is set by mmc_gpiod_request_ro() called from mmc_of_parse().
However, it does not make sense to specify "wp-gpios" property and
"toshiba,mmc-wrprotect-disable" at the same time.

I checked under arch/arm/boot/dts/ and arch/arm64/boot/dts/renesas/,
and I did not see any Renesas boards with "wp-gpios".  So, this
conversion should be safe.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

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