trie: refactor lock class

[gabrocheleau]

This PR refactors the trie package to use the Lock class from util instead of the duplicated one in the trie package.

[codecov]

Codecov Report

Merging #3109 (10847d8) into master (a8ac9bb) will decrease coverage by 0.04%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

❗ Current head 10847d8 differs from pull request most recent head 9509f8b. Consider uploading reports for the commit 9509f8b to get more accurate results

Additional details and impacted files

Flag	Coverage Δ
block	88.78% <ø> (ø)
blockchain	92.61% <ø> (ø)
client	87.68% <ø> (-0.04%)	⬇️
common	98.19% <ø> (ø)
ethash	∅ <ø> (∅)
evm	71.87% <ø> (ø)
rlp	∅ <ø> (∅)
statemanager	90.30% <ø> (ø)
trie	90.08% <100.00%> (-0.32%)	⬇️
tx	96.36% <ø> (ø)
util	86.97% <ø> (ø)
vm	76.21% <ø> (ø)

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[acolytec3]

LGTM.