net: Make CMD_NET a menuconfig

Previously, CMD_NET was an alias for 2 commands (bootp and tftpboot) and
they we not able to be disabled. Separate out those 2 commands and move
CMD_NET up to the menu level, which more accurately represents the code.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

Reviewed-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Duncan Hare <dh@synoia.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index d440675..fb74227 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1021,25 +1021,35 @@
 
 endmenu
 
-menu "Network commands"
-
 if NET
 
-config CMD_NET
-	bool "bootp, tftpboot"
+menuconfig CMD_NET
+	bool "Network commands"
+	default y
+
+if CMD_NET
+
+config CMD_BOOTP
+	bool "bootp"
 	default y
 	help
-	  Network commands.
 	  bootp - boot image via network using BOOTP/TFTP protocol
+
+config CMD_TFTPBOOT
+	bool "tftpboot"
+	default y
+	help
 	  tftpboot - boot image via network using TFTP protocol
 
 config CMD_TFTPPUT
 	bool "tftp put"
+	depends on CMD_TFTPBOOT
 	help
 	  TFTP put command, for uploading files to a server
 
 config CMD_TFTPSRV
 	bool "tftpsrv"
+	depends on CMD_TFTPBOOT
 	help
 	  Act as a TFTP server and boot the first received file
 
@@ -1050,13 +1060,12 @@
 
 config CMD_DHCP
 	bool "dhcp"
-	depends on CMD_NET
+	depends on CMD_BOOTP
 	help
 	  Boot image via network using DHCP/TFTP protocol
 
 config CMD_PXE
 	bool "pxe"
-	depends on CMD_NET
 	select MENU
 	help
 	  Boot image via network using PXE protocol
@@ -1107,7 +1116,7 @@
 
 endif
 
-endmenu
+endif
 
 menu "Misc commands"