boards: arm: bt510: Update clock error
boards: arm: bt510: Update clock error

The 32KHz crystal used is a tuning fork crystal which can have a larger
clock drift over temperature than an AT cut crystal, therefore the LFXO
clock source error rate needs updating to account for this possible
drift over temperature.

Signed-off-by: Jamie McCrae <7c977670495befe33b67661379bf81cc6b3660ab@lairdconnect.com>

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