You'd probably have to opt for a custom ROM for that... If one exists that tweaks that. Google moved to that style when they went though the Material Design overhaul starting with 5.0.
I'm not sure you'll be able to tweak that on other OEMs, either. Lockscreen customization was a huge security hole... Remember back in 4.4 where you could have widgets on the lockscreen? Even highly customized versions of Android often leave that area be in order to reduce risk.