siflower: move soruce-only flag to sf19a2890 subtarget

sf21 contains support for Bananapi BPI-RV2 which is a board available
to the general public. Limit the source-only flag to sf19a2890 instead.

Signed-off-by: Chuanhong Guo <[email protected]>

target/linux/siflower/Makefile

@@ -4,7 +4,7 @@ include $(TOPDIR)/rules.mk
 ARCH:=mipsel
 BOARD:=siflower
 BOARDNAME:=Siflower SoCs
-FEATURES:=squashfs usb usbgadget source-only
+FEATURES:=squashfs usb usbgadget
 SUBTARGETS:=sf19a2890 sf21
 
 KERNEL_PATCHVER:=6.6

target/linux/siflower/sf19a2890/target.mk

@@ -1,7 +1,7 @@
 ARCH:=mipsel
 SUBTARGET:=sf19a2890
 BOARDNAME:=Siflower SF19A2890 based boards
-FEATURES+=fpu
+FEATURES+=fpu source-only
 CPU_TYPE:=24kc
 CPU_SUBTYPE:=24kf