boards: cv*a6: Add twister support

This commit adds the necessary configurations for building and testing
cva6 boards (cv64a6_genesys_2, cv32a6_genesys_2) with twister.
This has been validated against commit
8a9d7a832b7121dd6f9be61a380d1d89ebf2a5f3 of the cva6 hardware project.

Signed-off-by: Eric Ackermann <eric.ackermann@cispa.de>

boards/openhwgroup/cv32a6_genesys_2/cv32a6_genesys_2.yaml

@@ -0,0 +1,12 @@
+identifier: cv32a6_genesys_2
+name: OpenHW Group cv32a6 on Genesys 2
+type: mcu
+arch: riscv
+ram: 1048576
+toolchain:
+  - zephyr
+supported:
+  - gpio
+  - spi
+  - uart
+vendor: openhwgroup

boards/openhwgroup/cv64a6_genesys_2/cv64a6_genesys_2.yaml

@@ -0,0 +1,12 @@
+identifier: cv64a6_genesys_2
+name: OpenHW Group cv64a6 on Genesys 2
+type: mcu
+arch: riscv
+ram: 1048576
+toolchain:
+  - zephyr
+supported:
+  - gpio
+  - spi
+  - uart
+vendor: openhwgroup