pinctrl: qcom: Remove the unused _groups variable build warning

When building with clang toolchain and arm64-randconfig-r015-20230712
kernel test robot reports the below warning.

 drivers/pinctrl/qcom/pinctrl-ipq5018.c:244:27: warning: unused variable '_groups' [-Wunused-const-variable]
   static const char * const _groups[] = {
                             ^
   1 warning generated.

     static const char * const _groups[] = {
             "gpio0", "gpio1", "gpio2", "gpio3", "gpio4", "gpio5", "gpio6", "gpio7",
             "gpio8", "gpio9", "gpio10", "gpio11", "gpio12", "gpio13", "gpio14",
             "gpio15", "gpio16", "gpio17", "gpio18", "gpio19", "gpio20", "gpio21",
             "gpio22", "gpio23", "gpio24", "gpio25", "gpio26", "gpio27", "gpio28",
             "gpio29", "gpio30", "gpio31", "gpio32", "gpio33", "gpio34", "gpio35",
             "gpio36", "gpio37", "gpio38", "gpio39", "gpio40", "gpio41", "gpio42",
             "gpio43", "gpio44", "gpio45", "gpio46",
   };

Fixing it by removing the variable.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202307120814.vWPY6URk-lkp@intel.com/
Fixes: 725d1c89 ("pinctrl: qcom: Add IPQ5018 pinctrl driver")
Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/1689934361-32642-1-git-send-email-quic_srichara@quicinc.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/qcom/pinctrl-ipq5018.c

@@ -241,16 +241,6 @@ static const char * const atest_char_groups[] = {
 	"gpio0", "gpio1", "gpio2", "gpio3", "gpio37",
 };
 
-static const char * const _groups[] = {
-	"gpio0", "gpio1", "gpio2", "gpio3", "gpio4", "gpio5", "gpio6", "gpio7",
-	"gpio8", "gpio9", "gpio10", "gpio11", "gpio12", "gpio13", "gpio14",
-	"gpio15", "gpio16", "gpio17", "gpio18", "gpio19", "gpio20", "gpio21",
-	"gpio22", "gpio23", "gpio24", "gpio25", "gpio26", "gpio27", "gpio28",
-	"gpio29", "gpio30", "gpio31", "gpio32", "gpio33", "gpio34", "gpio35",
-	"gpio36", "gpio37", "gpio38", "gpio39", "gpio40", "gpio41", "gpio42",
-	"gpio43", "gpio44", "gpio45", "gpio46",
-};
-
 static const char * const wci_txd_groups[] = {
 	"gpio0", "gpio1", "gpio2", "gpio3",
 	"gpio42", "gpio43", "gpio44", "gpio45",