soc/amd/picasso: introduce and use devicetree aliases for I2C2&I2C3

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I06102f4fcc3bf9de332c71a52c632241b95cde19
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55543
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/amd/picasso/chipset.cb

@@ -43,4 +43,7 @@ chip soc/amd/picasso
 		device pci 18.6 alias data_fabric_6 on end
 		device pci 18.7 alias data_fabric_7 on end
 	end
+
+	device mmio 0xfedc4000 alias i2c_2 off end
+	device mmio 0xfedc5000 alias i2c_3 off end
 end