arm64: dts: uniphier: fix input delay value for legacy mode of eMMC

The property of the legacy mode for the eMMC PHY turned out to
be wrong.  Some eMMC devices are unstable due to the set-up/hold
timing violation.  Correct the delay value.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>