fix(drivers/rcar3): i2c_dvfs: fix I2C operation

This commit fixes value to write to the ICCR register according to
the hardware manual.

Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Change-Id: I1f612a482c012a6739e2f31db80224b222df766c
1 file changed