[DLR only] malloc() & free() in interrupt context when handling DLR beacon timeout event

HalEdd_2PS_GetBcnTimeoutFrameBuffer() and HalEdd_2PS_FreeDlrBuffer() is called by HalEdd_2PS_Isr_MSYNC() in interrupt context and in turn call malloc(), free() which lock a mutex.

This can make the device become unresponsive (crash).

The issue can occurr in a ring topology only. Therefore, only EtherNet/IP is affected.
In general, the issue can show up when the DLR ring gets broken and the netX device detects a beacon timeout on one of its ports. The probability of this issue is also dependent on the other devices in the ring and their timing behavior realted to DLR events and messages.