Add R8A7745/SK-RZG1E PFC support

Hello.

Here's the set of 3 patches against Simon Horman's 'renesas.git' repo,
'renesas-devel-20170410-v4.11-rc6' tag. We're adding the R8A7745 PFC node and then describe the pins for SCIF2 and Ether devices declared earlier. These patches depend on the R8A7745 PFC suport in order to work properly.

[1/3] ARM: dts: r8a7745: add PFC support
[2/3] ARM: dts: sk-rzg1e: add SCIF2 pins
[3/3] ARM: dts: sk-rzg1e: add Ether pins

WBR, Sergei