vdso: Drop kconfig GENERIC_VDSO_32

This configuration is never used.

Remove it.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250826-vdso-cleanups-v1-7-d9b65750e49f@linutronix.de

Author: t-8ch

arch/arm/mm/Kconfig

@@ -926,7 +926,6 @@ config VDSO
 	default y if ARM_ARCH_TIMER
 	select HAVE_GENERIC_VDSO
 	select GENERIC_TIME_VSYSCALL
-	select GENERIC_VDSO_32
 	select GENERIC_GETTIMEOFDAY
 	select GENERIC_VDSO_DATA_STORE
 	help

arch/x86/Kconfig

@@ -14,7 +14,6 @@ config X86_32
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select CLKSRC_I8253
 	select CLONE_BACKWARDS
-	select GENERIC_VDSO_32
 	select HAVE_DEBUG_STACKOVERFLOW
 	select KMAP_LOCAL
 	select MODULES_USE_ELF_REL

lib/vdso/Kconfig

@@ -12,13 +12,6 @@ config GENERIC_GETTIMEOFDAY
 	  Each architecture that enables this feature has to
 	  provide the fallback implementation.
 
-config GENERIC_VDSO_32
-	bool
-	depends on GENERIC_GETTIMEOFDAY && !64BIT
-	help
-	  This config option helps to avoid possible performance issues
-	  in 32 bit only architectures.
-
 config GENERIC_COMPAT_VDSO
 	bool
 	help