python: Fix multiline quotes in a single line

An example case,
```python
mem_side_port = RequestPort(
    "This port sends requests and " "receives responses"
)
```

This is the residue of running the python formatter.
This is done by finding all tokens matching the regex `"\s"(?![.;"])`
and manually replacing them by empty strings.

Change-Id: Icf223bbe889e5fa5749a81ef77aa6e721f38b549
Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/66111
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>

util/plot_dram/dram_sweep_plot.py

@@ -90,7 +90,7 @@ def main():
 
     for line in simout:
         match = re.match(
-            "DRAM sweep with " "burst: (\d+), banks: (\d+), max stride: (\d+)",
+            "DRAM sweep with burst: (\d+), banks: (\d+), max stride: (\d+)",
             line,
         )
         if match: