Remove unused bios log level function

Co-Authored-By: Luke Lau <luke_lau@icloud.com>

Author: fendor

app/MainHie.hs

@@ -121,7 +121,6 @@ run opts = do
 
  let initOpts = defaultCradleOpts { cradleOptsVerbosity = verbosity }
  verbosity = if optBiosVerbose opts then Verbose else Silent
- -- biosLogLevel = if optBiosVerbose opts then L.DEBUG else L.INFO
 
 
  when (optBiosVerbose opts) $