sched/clock: Fix local_clock() before sched_clock_init()

sched/clock: Fix local_clock() before sched_clock_init()

Have local_clock() return sched_clock() if sched_clock_init() has not
yet run. sched_clock_cpu() has this check but it was not included in the
new noinstr implementation of local_clock().

The effect can be seen on x86 with CONFIG_PRINTK_TIME enabled, for
instance. scd->clock quickly reaches the value of TICK_NSEC and that
value is returned until sched_clock_init() runs.

dmesg without this patch:

    [    0.000000] kvm-clock: ...
    [    0.000002] kvm-clock: ...
    [    0.000672] clocksource: ...
    [    0.001000] tsc: ...
    [    0.001000] e820: ...
    [    0.001000] e820: ...
     ...
    [    0.001000] ..TIMER: ...
    [    0.001000] clocksource: ...
    [    0.378956] Calibrating delay loop ...
    [    0.379955] pid_max: ...

dmesg with this patch:

    [    0.000000] kvm-clock: ...
    [    0.000001] kvm-clock: ...
    [    0.000675] clocksource: ...
    [    0.002685] tsc: ...
    [    0.003331] e820: ...
    [    0.004190] e820: ...
     ...
    [    0.421939] ..TIMER: ...
    [    0.422842] clocksource: ...
    [    0.424582] Calibrating delay loop ...
    [    0.425580] pid_max: ...

Fixes: 776f22913b8e ("sched/clock: Make local_clock() noinstr")
Signed-off-by: Aaron Thompson <dev@aaront.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20230413175012.2201-1-dev@aaront.org