riscv: vdso: Drop CONFIG_GENERIC_TIME_VSYSCALL guard around syscall fallbacks

The syscall definitions can be built just fine for 32-bit systems.
Also the guard does not cover __arch_get_hw_counter() which is always
used together with those system call fallbacks. Also this header is
unused when no vDSO is built anyways.

Drop the ifdeffery. The logic will be simpler to understand. Furthermore
this prepares the complete removal of CONFIG_GENERIC_TIME_VSYSCALL.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260519-vdso-generic_time_vsyscal-v1-1-5c2a5905d5f5@linutronix.de

Author: t-8ch

arch/riscv/include/asm/vdso/gettimeofday.h

@@ -9,12 +9,6 @@
 #include <asm/csr.h>
 #include <uapi/linux/time.h>
 
-/*
- * 32-bit land is lacking generic time vsyscalls as well as the legacy 32-bit
- * time syscalls like gettimeofday. Skip these definitions since on 32-bit.
- */
-#ifdef CONFIG_GENERIC_TIME_VSYSCALL
-
 #define VDSO_HAS_CLOCK_GETRES	1
 
 static __always_inline
@@ -66,8 +60,6 @@ int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
 	return ret;
 }
 
-#endif /* CONFIG_GENERIC_TIME_VSYSCALL */
-
 static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
 						 const struct vdso_time_data *vd)
 {