Example MPC5676R DSPI MasterSlave DMA CW210

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* Detailed Description:
* Application performs basic initialization, setup PLL to maximum allowed freq.
* DSPI_A is configured as master, DSPI_B is configured as slave.
* DSPI modules are connected together by wires on EVB.
* Four DMA descriptors are initialized:
* - master transmit
* - master receive
* - slave transmit
* - slave receive
* All transfers are done by DMA, master sends/receives 8 words and slave
* receives/sends 8 words.
* ------------------------------------------------------------------------------
* Test HW:         XPC567XKIT516 - MPC567xADAT516 Rev.D, MPC567XEVBFXMB Rev.C
* MCU:             PPC5676RDMVY1 3N23A
* Fsys:            180MHz
* Debugger:        Lauterbach Trace32
* Target:          RAM, internal_FLASH
* EVB connection: PCSA0 (J29-1) -> PCSB0 (J30-1)
*                  SIN_A (J29-7) -> SOUT_B (J30-8)
*                  SOUT_A (J29-8) -> SIN_B (J30-7)
*                  SCK_A (J29-9) -> SCK_B (J30-9)
*
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