When adding GP-1-28 port pin support it was forgotten to remove the
CLKOUT pin from the list of pins that are not associated with a GPIO
port in pinmux_pins[]. This results in a warning when reading the
pinctrl files in sysfs as the CLKOUT pin is still added as a none GPIO
pin. Fix this by removing the duplicated entry which is no longer
needed.

~ # cat /sys/kernel/debug/pinctrl/e6060000.pin-controller/pinconf-pins
[   89.432081] ------------[ cut here ]------------
[   89.436904] Pin 496 is not in bias info list
[   89.441252] WARNING: CPU: 1 PID: 456 at drivers/pinctrl/sh-pfc/core.c:408 sh_pfc_pin_to_bias_reg+0xb0/0xb8
[   89.451002] CPU: 1 PID: 456 Comm: cat Not tainted 4.16.0-rc1-arm64-renesas-00048-gdfafc344a4f24dde #12
[   89.460394] Hardware name: Renesas Salvator-X 2nd version board based on r8a7795 ES2.0+ (DT)
[   89.468910] pstate: 80000085 (Nzcv daIf -PAN -UAO)
[   89.473747] pc : sh_pfc_pin_to_bias_reg+0xb0/0xb8
[   89.478495] lr : sh_pfc_pin_to_bias_reg+0xb0/0xb8
[   89.483241] sp : ffff00000aff3ab0
[   89.486587] x29: ffff00000aff3ab0 x28: ffff00000893c698
[   89.491955] x27: ffff000008ad7d98 x26: 0000000000000000
[   89.497323] x25: ffff8006fb3f5028 x24: ffff8006fb3f5018
[   89.502690] x23: 0000000000000001 x22: 00000000000001f0
[   89.508057] x21: ffff8006fb3f5018 x20: ffff000008bef000
[   89.513423] x19: 0000000000000000 x18: ffffffffffffffff
[   89.518790] x17: 0000000000006c4a x16: ffff000008d67c98
[   89.524157] x15: 0000000000000001 x14: ffff00000896ca98
[   89.529524] x13: 00000000cce5f611 x12: ffff8006f8d3b5a8
[   89.534891] x11: ffff00000981e000 x10: ffff000008befa08
[   89.540258] x9 : ffff8006f9b987a0 x8 : ffff000008befa08
[   89.545625] x7 : ffff000008137094 x6 : 0000000000000000
[   89.550991] x5 : 0000000000000000 x4 : 0000000000000001
[   89.556357] x3 : 0000000000000007 x2 : 0000000000000007
[   89.561723] x1 : 1ff24f80f1818600 x0 : 0000000000000000
[   89.567091] Call trace:
[   89.569561]  sh_pfc_pin_to_bias_reg+0xb0/0xb8
[   89.573960]  r8a7795_pinmux_get_bias+0x30/0xc0
[   89.578445]  sh_pfc_pinconf_get+0x1e0/0x2d8
[   89.582669]  pin_config_get_for_pin+0x20/0x30
[   89.587067]  pinconf_generic_dump_one+0x180/0x1c8
[   89.591815]  pinconf_generic_dump_pins+0x84/0xd8
[   89.596476]  pinconf_pins_show+0xc8/0x130
[   89.600528]  seq_read+0xe4/0x510
[   89.603789]  full_proxy_read+0x60/0x90
[   89.607576]  __vfs_read+0x30/0x140
[   89.611010]  vfs_read+0x90/0x170
[   89.614269]  SyS_read+0x60/0xd8
[   89.617443]  __sys_trace_return+0x0/0x4
[   89.621314] ---[ end trace 99c8d0d39c13e794 ]---

Fixes: 82d2de5a ("pinctrl: sh-pfc: r8a7795: Add GP-1-28 port pin support")
Reviewed-and-tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>