(a) Add memory fence for RING QUEUE operation
  - J7 platform use Message mode -> no  QUEUE operation happens -> no need FENCE
  - SMPU SDK does not support FENCE -> this is the code in SMPU SDK

    static inline void CSL_archMemoryFence(void)
    {
    #if defined (__aarch64__)
        Armv8_dsbSy();
    #endif
    #if (__ARM_ARCH == 7) && (__ARM_ARCH_PROFILE == 'R') /* R5F */
        //CSL_armR5Dsb(); //TODO
    #endif
    } 

(b) Remove cache invalidate for DMA desc in Eth_receiveProcess function
After DMA filled descriptor Eth_receiveProcess always need to invalidate that descriptor to read latest content

(c) Invalidate Rx user data right before submit to queue: Eth_receiveProcess
Scenario need to address:

1. Receive packet N, packet buffer is in cache
2. Packet N is recycled -> submitted back to FQ
3. Packet M is received, which reutilizes same packet buffer
4. Buffer in DDR has new content of packet M, but cache has content of packet N
5. Packet buffer in cache gets flushed to DDR automatically
6. Packet M content is corrupted