trenz_tec0117: Add SDCard (SPI and SD mode), move SPI Flash to 0x00000000 and use default l2_cache_min_data_width.

1.  Digilent CMOD A7
      https://reference.digilentinc.com/programmable-logic/cmod-a7/start

2. Digilent Nexys 4
      https://reference.digilentinc.com/programmable-logic/nexys-4/start

3. MicroNova Mercury 2
      https://www.micro-nova.com/mercury-2

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

LitePCIe Gen3 X4 enumerating correctly.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

The pin outs come from LUNA :
https://github.com/greatscottgadgets/luna/blob/main/luna/gateware/platform/icebreaker.py#L94



and are some commonly used ones from other projects / pmods.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

As with the other versions, the clk pin can't be directly driven

Mini Monitor 4K and Mini Recorder 4K are almost the same hardware with just changes on
the Video In/Out. For now tests have been done on the Mini Monitor 4K, but the aim  is
support both boards in the same platform/target in the future, thus the mini_4k naming.

These boards could be used as affordable Artix7 dev boards for LiteX, to run Linux with
LiteX (512MB of RAM + a Video Framebuffer) or to create custom systems like a fast software
defined signal generator/recorder directly from a PC over PCIe, custom HDMI/SDI video
cards, etc... lots of possibilities :)