ARM: shmobile: r8a7778 dtsi: Remove duplicate i2c nodes

"ARM: shmobile: r8a7778: add I2C support on DTSI" was applied twice:

    commit ae4273ec
    commit 3acb51b9

Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>