pinctrl: renesas: r8a779f0: Remove unused POC2

The POWER Condition Control Register 2 (POC2) is unused, and the
documentation does not define any valid bits. Remove it.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Link: https://lore.kernel.org/r/d8a9e[e-mail]

drivers/pinctrl/renesas/pfc-r8a779f0.c

···
 enum ioctrl_regs {
 	POC0,
 	POC1,
-	POC2,
 	POC3,
 	TD0SEL1,
 };
···
 static const struct pinmux_ioctrl_reg pinmux_ioctrl_regs[] = {
 	[POC0] = { 0xe60500a0, },
 	[POC1] = { 0xe60508a0, },
-	[POC2] = { 0xe60510a0, },
 	[POC3] = { 0xe60518a0, },
 	[TD0SEL1] = { 0xe6050920, },
 	{ /* sentinel */ },