Add missing signal data to R8A7791 PFC driver

Hello!

Here's a set of 2 patches against the 'fixes' branch of Linus Walleij's
'linux-pinctrl.git'. The patches add support for (1) the HSCIF1 configured to use signal group E (which is currently broken) and for (2) the DVC_MUTE signal.

[1/2] pinctrl: sh-pfc: r8a7791: add missing HSCIF1 pinmux data [2/2] pinctrl: sh-pfc: r8a7791: add missing DVC_MUTE signal

MBR, Sergei