Fix: decoding buffer length issue

[AbeereSpark]

Description:

• The buffer_len was not getting updated so we fixed it by uncommenting ezlopi_core_buffer_acquire function which resolved the issue but causing memory leak. Now the code has been modified to use the dynamically allocated buffer and not ezlopi_core_buffer_acquire.

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with EzloPi core
• I accept the CLA.