ARM: dts: r8a7792: fix misindented line

Commit 2a0900655d5e (ARM: dts: r8a7792: add I2C support) had a wrongly
indented line at the end of the "aliases" subnode -- fix it.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>