feat: support build tag with rocksdb

[mmsqe]

to avoid undefined: config.OpenDB when build with rocksdb

Description

Closes: #XXXX

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[vladjdk]

Could you move this to this file/folder? We had a small refactor:

evm/server/start.go

Line 685 in fb7e407

func openDB(_ types.AppOptions, home string, backendType dbm.BackendType) (dbm.DB, error) {

[vladjdk]

Lgtm, thanks!