Fix problem of RepackApexPayload when using option --signing_args

The apex_util -> deapexer transition still passes signing args in as 1
huge string, just without the double qoutes. Once deapexer receives
the arugment, deapexer would attempt to shlex it, but double
quotes prevents proper shlexing, hence remove the double quotes.
As we added to log to monitor args parser when run apexer from
RepackApexPayload

2024-07-30 12:42:03 - common.py - INFO    :   Individual args list:
['/home/hieu/aosp/out/host/linux-x86/bin/apexer', '--force',
'--payload_only', '--do_not_check_keyname', '--apexer_tool_path',
'/home/hieu/aosp/out/host/linux-x86/bin:/home/hieu/aosp/out/host/linux-x86/bin:/home/hieu/aosp/out/host/linux-x86/bin:/home/hieu/aosp/prebuilts/clang/host/linux-x86/llvm-binutils-stable:/home/hieu/aosp/prebuilts/asuite/acloud/linux-x86:/home/hieu/aosp/prebuilts/asuite/aidegen/linux-x86:/home/hieu/aosp/prebuilts/asuite/atest/linux-x86:/home/hieu/aosp/prebuilts/jdk/jdk17/linux-x86/bin:/home/hieu/aosp/build/bazel/bin:/home/hieu/aosp/development/scripts:/home/hieu/aosp/prebuilts/devtools/tools:/home/hieu/aosp/prebuilts/misc/linux-x86/dtc:/home/hieu/aosp/prebuilts/misc/linux-x86/libufdt:/home/hieu/aosp/prebuilts/android-emulator/linux-x86_64:/home/hieu/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/usr/lib/wsl/lib:/mnt/c/Program Files/WindowsApps/MicrosoftCorporationII.WindowsSubsystemForLinux_2.2.4.0_x64__8wekyb3d8bbwe:/mnt/c/WINDOWS/system32:/mnt/c/WINDOWS:/mnt/c/WINDOWS/System32/Wbem:/mnt/c/WINDOWS/System32/WindowsPowerShell/v1.0/:/mnt/c/WINDOWS/System32/OpenSSH/:/mnt/c/Program Files/7-Zip:/mnt/c/Users/hnguy140/AppData/Local/Microsoft/WindowsApps:/snap/bin', '--manifest', '/tmp/tmpjk8as91m/apex_manifest.pb', '--build_info', '/tmp/tmpjk8as91m/apex_build_info.pb',
'--key', 'key_dir/avb.pem',
'--signing_args', '--signing_helper_with_files external/fnv/production-sign-tools/production-signing-scripts/IVIMB/signing_helper/avb_signing_helper.py',
'/tmp/tmpji2gvei4', '/tmp/tmpjk8as91m/apex_payload.img', '-v']

As monitor from the above log '--signing_helper_with_files
.../avb_signing_helper.py' is considered as a single argument which make
apexer to be confused. The correct ways of parsing arguments is
'--signing_helper_with_files' and '.../avb_signing_helper' should be
separate to 2 arguments instead merge it as one like current
implementation.

Change-Id: I913b6b3f2ff03d8ce2333b1c2c38178967766778
Signed-off-by: Hieu Nguyen <hnguy140@ford.com>