pinctrl: sh-pfc: Add optional arg to VIN_DATA_PIN_GROUP

VIN data groups may appear on different sets of pins, usually named
"vinX_data_[a|b]". The existing VIN_DATA_PIN_GROUP() does not support
appending the '_a' or '_b' suffix, leading to the definition of group
names not consistent with the ones defined using the SH_PFC_PIN_GROUP()
macro.

Fix this by making the VIN_DATA_PIN_GROUP macro a variadic one,
which accepts an optional 'version' argument.

Fixes: 423caa52 ("pinctrl: sh-pfc: r8a779[01]: Move 'union vin_data' to shared header file")
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>