mmc: sdhci-iproc: remove hard coded mmc cap 1.8v

commit 4c94238f37af87a2165c3fb491b4a8b50e90649c upstream.

Remove hard coded mmc cap 1.8v from platform data as it is board specific.
The 1.8v DDR mmc caps can be enabled using DTS property for those
boards that support it.

Fixes: b17b4ab8 ("mmc: sdhci-iproc: define MMC caps in platform data")
Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
Signed-off-by: Scott Branden <scott.branden@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Cc: stable@vger.kernel.org # v4.8+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>