Fix log print format warning for GNU ARM compiler

[chinglee-iot]

Description

• Fix the compilation warning of GNU ARM compiler.

Test Steps

Reference this branch https://github.com/chinglee-iot/FreeRTOS-Cellular-Interface/tree/add-compiler-warning-check
GCC
Build with the following command should not have error.

cmake -S test -B build -DCMAKE_C_COMPILER_WORKS=1
cd build
make compilation_test

GNU arm
Build with the following command should not have error.

CC=arm-none-eabi-gcc cmake -B build -S test -DCMAKE_C_COMPILER_WORKS=1
cd build
make compilation_test

Checklist:

• I have tested my changes. No regression in existing tests.
• I have modified and/or added unit-tests to cover the code changes in this Pull Request.

Related Issue

#150
By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[guillaumeVolery]

Thank you @chinglee-iot 👍