DWARF Expressions are encoded with a `DW_CFA_def_cfa_expression` or
`DW_CFA_expression` (as per aarch64 DWARF ABI). However
grepping for either in `.eh_frame` debug information did not show any
results (including hardcoded PLT patter heuristics) unlike in x86.
(See #1058 for the x86 implementation).

Tested on system binaries and libc in multiple distros:
Debian, Fedora, Centos, Ubuntu

Workflow:
```
`docker run -it --network=host arm64v8/fedora bash`
`docker cp 0693985d3bba:/ ./fedrepo`

`sudo readelf -wf ./fedrepo/bin/* 2>/dev/null | grep
DW_CFA_cfa_def_expression`
`sudo readelf -wF ./centos-repo/bin/* 2>/dev/null | grep exp`

```
Return an error for now if we come across an expression in Arm64 binaries.

Signed-off-by: Sumera Priyadarsini <[email protected]>