MADRID (Reuters) -Spanish GDP grew faster in the second quarter than originally estimated, compared with the prior quarter, reflecting a healthy Easter rebound from the winter months and a more robust export rise, data from the National Statistics Institute showed on Friday. INE upgraded quarterly growth in the period to 1.5% from an original 1.1% while the year-on-year growth figure was revised to 6.8% from 6.3%, after it recalculated the GDP historical series in 2020 and 2021. INE also revised down first quarter data to a 0.2% quarterly contraction from 0.2% growth, although annual growth wa…