mb/amd/onyx: rename to onyx_poc

Even though this mainboard is called 'Onyx', the openSIL implementation
and the corresponding coreboot integration is only a proof of concept
that isn't fully featured, has known limitations and bugs, and is not
meant for or ready to being productized. Adding the proof of concept
suffix to the name should point this out clearly enough so that no
potential customer could infer that this might be a fully functional
and supported implementation which it is not.

Change-Id: I157a8fffdc2a8543465fe8d444ac87f3f417389f
Signed-off-by: Varshit Pandya <pandyavarshit@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77896
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

src/mainboard/amd/onyx/Kconfig.name

@@ -1,2 +0,0 @@
-config BOARD_AMD_ONYX
-	bool "Onyx"

src/mainboard/amd/onyx_poc/Kconfig

@@ -1,4 +1,4 @@
-if BOARD_AMD_ONYX
+if BOARD_AMD_ONYX_POC
 
 config BOARD_SPECIFIC_OPTIONS
 	def_bool y
@@ -7,14 +7,14 @@ config BOARD_SPECIFIC_OPTIONS
 	select AMD_SOC_CONSOLE_UART
 
 config FMDFILE
-	default "src/mainboard/amd/onyx/board.fmd"
+	default "src/mainboard/amd/onyx_poc/board.fmd"
 
 
 config MAINBOARD_DIR
-	default "amd/onyx"
+	default "amd/onyx_poc"
 
 config MAINBOARD_PART_NUMBER
-	default "Onyx"
+	default "Onyx_poc"
 
 # Use BMC SOL console on SoC UART1 by default
 config UART_FOR_CONSOLE

src/mainboard/amd/onyx_poc/Kconfig.name

@@ -0,0 +1,2 @@
+config BOARD_AMD_ONYX_POC
+	bool "Onyx_poc"