Ad7616 Split serial vs parallel modes

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The axi_ad7616 IP will now contain only the parallel data path of the ADC and the serial infrastructure will be replaced with the SPI Engine framework within the common block design.

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Guideline check fails with the following message:

Files with name errors: library/axi_ad7616/axi_ad7616_maxis2wrfifo.v

because the file has been deleted, as it is no longer needed for the axi_ad7616 IP.

[alin724]

ad7616_sdz_zc706_pi:

• modify adc_db_io ad_iobuf instantiation similarly to the definition in the ad7616_sdz_zed_pi

ad7616_sdc_zed_pi:

• Update the conversion start signal to the new name, adc_cnvst, in the parallel system_top and constraints files in the project.

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v2: Regenerated Makefile for ad7616_sdz/zc706

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v3: Fix interrupts

[LIacob106]

Guideline checker failing.

[sarpadi]

please add readme files with build instructions like for the ad4630 https://github.com/analogdevicesinc/hdl/blob/ad7616_split_si_pi_v2/projects/ad4630_fmc/zed/README.md

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v4: Rebased on master.

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v5. Squashed commits. Rebased to master.

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The IRQ output of AXI_AD7616 us not used any more.

In the system_project.tcl, an example of the non default mode should be given. make SER_PAR_N=0

Also, ZC706 support can be removed in a separate commit part of this pull request.

Done.

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v6. Added axi_clkgen instead of using only the sys_cpu_clk