[PATCH v2] pinctrl: meson: fix unused variable warning

[Qianggui Song <qianggui.song@xxxxxxxxxxx>]

The kernel test robot reported a warning as below:
>> drivers/pinctrl/meson/pinctrl-meson-s4.c:178:27: warning: unused variable 'tdm_sclk1_c_pins' [-Wunused-const-variable]
   static const unsigned int tdm_sclk1_c_pins[]            = { GPIOC_3 };

Fix it by adding missing description about this pins

Fixes: 775214d389c2 ("pinctrl: meson: add pinctrl driver support for Meson-S4 Soc")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Qianggui Song <qianggui.song@xxxxxxxxxxx>
---
 drivers/pinctrl/meson/pinctrl-meson-s4.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/meson/pinctrl-meson-s4.c b/drivers/pinctrl/meson/pinctrl-meson-s4.c
index 3c7358f53302..cea77864b880 100644
--- a/drivers/pinctrl/meson/pinctrl-meson-s4.c
+++ b/drivers/pinctrl/meson/pinctrl-meson-s4.c
@@ -575,6 +575,7 @@ static struct meson_pmx_group meson_s4_periphs_groups[] = {
 	GROUP(tdm_d2_c,			4),
 	GROUP(tdm_d3_c,			4),
 	GROUP(tdm_fs1_c,		4),
+	GROUP(tdm_sclk1_c,		4),
 	GROUP(mclk_1_c,			4),
 	GROUP(tdm_d4_c,			4),
 	GROUP(tdm_d5_c,			4),
@@ -936,7 +937,7 @@ static const char * const iso7816_groups[] = {
 };
 
 static const char * const tdm_groups[] = {
-	"tdm_d2_c", "tdm_d3_c", "tdm_fs1_c", "tdm_d4_c", "tdm_d5_c",
+	"tdm_d2_c", "tdm_d3_c", "tdm_fs1_c", "tdm_d4_c", "tdm_d5_c", "tdm_sclk1_c",
 	"tdm_fs1_d", "tdm_d4_d", "tdm_d3_d", "tdm_d2_d", "tdm_sclk1_d",
 	"tdm_sclk1_h", "tdm_fs1_h", "tdm_d2_h", "tdm_d3_h", "tdm_d4_h",
 	"tdm_d1", "tdm_d0", "tdm_fs0", "tdm_sclk0", "tdm_fs2", "tdm_sclk2",
-- 
2.34.1