ARM: shmobile: bockw dts: define sdhi0 pins with pull-ups

Ensures that the pull-ups for pins SD0_CD and SD0_WP are enabled.

This is one of two features from the DT reference platform that are
still missing in MP.

Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>