Re-add target/generic/Config.in options to menuconfig

The options to customize the hostname, the banner and the serial port
configuration are now inside a menu named 'System configuration'.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

Config.in

@@ -334,6 +334,8 @@ endmenu
 
 source "toolchain/Config.in"
 
+source "target/generic/Config.in"
+
 source "package/Config.in"
 
 source "fs/Config.in"

target/generic/Config.in

@@ -1,4 +1,4 @@
-if !(BR2_TARGET_ATMEL||BR2_TARGET_KWIKBYTE||BR2_TARGET_VALKA)
+menu "System configuration"
 
 config BR2_TARGET_GENERIC_HOSTNAME
        string "System hostname"
@@ -166,4 +166,4 @@ config BR2_TARGET_GENERIC_GETTY_BAUDRATE
 
 endif # BR2_TARGET_GENERIC_GETTY
 
-endif
+endmenu