ARM: dts: sun5i-a13-inet98v-rev2: Remove mmc2 node

The sun5i-a13-inet98v-rev2 does not have an emmc, it uses nand, the
mmc2 node in the dts comes from a copy and paste error from the
utoo-p66 dts, remove it.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>