The LD11 SoC is equipped with not only MIO-reset but also SD-reset
for controlling RST_n pin of the eMMC device.

Update the binding document and remove unneeded "." from each line
in itemization.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>