realtek: drop source-only from NAND targets

Now the NAND targets have real devices that need to be built.
Remove the source-only flag to make the images available.

Signed-off-by: Markus Stockhausen <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20255
Signed-off-by: Robert Marko <[email protected]>

target/linux/realtek/rtl930x_nand/target.mk

@@ -4,7 +4,7 @@ SUBTARGET:=rtl930x_nand
 CPU_TYPE:=24kc
 BOARD:=realtek
 BOARDNAME:=Realtek MIPS RTL930X (NAND)
-FEATURES+=nand source-only
+FEATURES+=nand
 
 define Target/Description
 	Build firmware images for Realtek RTL930x based boards.

target/linux/realtek/rtl931x_nand/target.mk

@@ -4,7 +4,7 @@ SUBTARGET:=rtl931x_nand
 CPU_TYPE:=24kc
 BOARD:=realtek
 BOARDNAME:=Realtek MIPS RTL931X (NAND)
-FEATURES+=nand source-only
+FEATURES+=nand
 
 define Target/Description
 	Build firmware images for Realtek RTL931x based boards.