stmmac: cleanup dead dependencies on STMMAC_PLATFORM and STMMAC_ETH in Kconfig

There are already 'if STMMAC_ETH' and 'STMMAC_PLATFORM'
conditions wrapping these config options, making the
'depends on' statements duplicate dependencies (dead code).

I propose leaving the outer 'if STMMAC_PLATFORM...endif' and
'if STMMAC_ETH...endif' conditions, and removing the
individual 'depends on' statements.

This dead code was found by kconfirm, a static analysis tool for Kconfig.

Signed-off-by: Julian Braha <julianbraha@gmail.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/20260402145858.240231-1-julianbraha@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/Kconfig

@@ -20,7 +20,6 @@ if STMMAC_ETH
 config STMMAC_SELFTESTS
 	bool "Support for STMMAC Selftests"
 	depends on INET
-	depends on STMMAC_ETH
 	default n
 	help
 	  This adds support for STMMAC Selftests using ethtool. Enable this
@@ -29,7 +28,6 @@ config STMMAC_SELFTESTS
 
 config STMMAC_PLATFORM
 	tristate "STMMAC Platform bus support"
-	depends on STMMAC_ETH
 	select MFD_SYSCON
 	default y
 	help
@@ -336,7 +334,6 @@ config DWMAC_IMX8
 config DWMAC_INTEL_PLAT
 	tristate "Intel dwmac support"
 	depends on OF && COMMON_CLK
-	depends on STMMAC_ETH
 	help
 	  Support for ethernet controllers on Intel SoCs
 
@@ -371,7 +368,7 @@ config DWMAC_VISCONTI
 	help
 	  Support for ethernet controller on Visconti SoCs.
 
-endif
+endif # STMMAC_PLATFORM
 
 config STMMAC_LIBPCI
 	tristate
@@ -381,7 +378,7 @@ config STMMAC_LIBPCI
 config DWMAC_INTEL
 	tristate "Intel GMAC support"
 	default X86
-	depends on X86 && STMMAC_ETH && PCI
+	depends on X86 && PCI
 	depends on COMMON_CLK
 	depends on ACPI
 	help
@@ -420,4 +417,4 @@ config STMMAC_PCI
 	  If you have a controller with this interface, say Y or M here.
 
 	  If unsure, say N.
-endif
+endif # STMMAC_ETH