[TLI][AArch64] Add TLI Mappings of @llvm.exp10 for ArmPL and SLEEF.

Update regex to _explicitly_ show which exp versions are added.
The previous regex used `exp[^e]` to avoid matching calls like:
`@llvm.experimental.stepvector`.

Note: ArmPL Mappings for scalable types are not yet utilized
(eg, `llvm.exp10.nxv2f64`, `llvm.exp10.nxv4f32`), as `replace-with-veclib`
pass needs improvements.