soc: mediatek: Let PMIC Wrapper and SCPSYS depend on OF

With the following configuration options:
CONFIG_OF is not set
CONFIG_MTK_PMIC_WRAP=y
CONFIG_MTK_SCPSYS=y
we get the following build warnings:

  CC      drivers/soc/mediatek/mtk-pmic-wrap.o
drivers/soc/mediatek/mtk-pmic-wrap.c:2138:34: warning: ‘of_pwrap_match_tbl’ defined but not used [-Wunused-const-variable=]
drivers/soc/mediatek/mtk-pmic-wrap.c:1953:34: warning: ‘of_slave_match_tbl’ defined but not used [-Wunused-const-variable=]
  CC      drivers/soc/mediatek/mtk-scpsys.o
drivers/soc/mediatek/mtk-scpsys.c:1084:34: warning: ‘of_scpsys_match_tbl’ defined but not used [-Wunused-const-variable=]

Looking at the code, both drivers can only bind to OF-defined device
nodes, so these drivers are useless without OF and should therefore
depend on it.

Also drop of_match_ptr() from both drivers. We already know what it
will resolve to, so we might as well save cpp some work.

Developers or QA teams who wish to test-build the code can still do
so by enabling CONFIG_OF, which is available on all architectures and
has no dependencies.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/all/202207240252.ZY5hSCNB-lkp@intel.com/
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Chenglin Xu <chenglin.xu@mediatek.com>
Link: https://lore.kernel.org/r/20220730144833.0a0d9825@endymion.delvare
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

drivers/soc/mediatek/Kconfig

@@ -37,6 +37,7 @@ config MTK_INFRACFG
 config MTK_PMIC_WRAP
 	tristate "MediaTek PMIC Wrapper Support"
 	depends on RESET_CONTROLLER
+	depends on OF
 	select REGMAP
 	help
 	  Say yes here to add support for MediaTek PMIC Wrapper found
@@ -46,6 +47,7 @@ config MTK_PMIC_WRAP
 config MTK_SCPSYS
 	bool "MediaTek SCPSYS Support"
 	default ARCH_MEDIATEK
+	depends on OF
 	select REGMAP
 	select MTK_INFRACFG
 	select PM_GENERIC_DOMAINS if PM

drivers/soc/mediatek/mtk-pmic-wrap.c

@@ -2316,7 +2316,7 @@ err_out1:
 static struct platform_driver pwrap_drv = {
 	.driver = {
 		.name = "mt-pmic-pwrap",
-		.of_match_table = of_match_ptr(of_pwrap_match_tbl),
+		.of_match_table = of_pwrap_match_tbl,
 	},
 	.probe = pwrap_probe,
 };

drivers/soc/mediatek/mtk-scpsys.c

@@ -1141,7 +1141,7 @@ static struct platform_driver scpsys_drv = {
 		.name = "mtk-scpsys",
 		.suppress_bind_attrs = true,
 		.owner = THIS_MODULE,
-		.of_match_table = of_match_ptr(of_scpsys_match_tbl),
+		.of_match_table = of_scpsys_match_tbl,
 	},
 };
 builtin_platform_driver(scpsys_drv);