vdso: Automatically select HAVE_GENERIC_VDSO if necessary

gettimeofday() and getrandom() in the vDSO require the vDSO datastore.

Enable it automatically if either one of them is enabled so the
architecture code doesn't need to know this.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Link: https://patch.msgid.link/20260709-vdso-have_generic_vdso-v1-4-d2e1061f268b@linutronix.de

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