pinctrl: sh-pfc: r8a77995: Remove unused PINMUX_IPSR_{MSEL2,PHYS}()

The PINMUX_IPSR_MSEL2() and PINMUX_IPSR_PHYS() macros are unused, and
will conflict with generic macros that are to be added.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>