cmd: mvebu: Rename rx_training to mvebu_comphy_rx_training

Rename the misleading cmd "rx_training" to "mvebu_comphy_rx_training" to
avoid confusion and mixup with DDR3/4 training. This makes it clear,
that this command is platform specific and handles the COMPHY RX
training.

Also depend this cmd on ARMADA_8K and not TARGET_MVEBU_ARMADA_8K to make
is available for OcteonTX2 CN913x.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Pali Rohár <pali@kernel.org>
Cc: Marek Behun <marek.behun@nic.cz>
Cc: Kostya Porotchkin <kostap@marvell.com>
Cc: Nadav Haklai <nadavh@marvell.com>
Acked-by: Marek Behún <marek.behun@nic.cz>
Acked-by: Pali Rohár <pali@kernel.org>
diff --git a/cmd/mvebu/Kconfig b/cmd/mvebu/Kconfig
index f0e4f88..7c42c75 100644
--- a/cmd/mvebu/Kconfig
+++ b/cmd/mvebu/Kconfig
@@ -49,11 +49,10 @@
 	  This option should contain a default file name to be used with
 	  MVEBU "bubt" command if the source file name is omitted
 
-config CMD_MVEBU_RX_TRAINING
-	bool "rx_training"
-	depends on TARGET_MVEBU_ARMADA_8K
-	default n
+config CMD_MVEBU_COMPHY_RX_TRAINING
+	bool "mvebu_comphy_rx_training"
+	depends on ARMADA_8K
 	help
-	  Perform RX training sequence
+	  Perform COMPHY RX training sequence
 
 endmenu