package/dtc: qemu system build need libfdt

The "install-bin" target just installs dtc's programs to host/bin
without libfdt, but building qemu system requires libfdt.

see: https://gitlab.com/c-sky/buildroot/-/jobs/38654503

So we need to install libfdt to satisfy the requirements of qemu.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/dtc/dtc.mk

@@ -51,7 +51,7 @@ define HOST_DTC_BUILD_CMDS
 endef
 
 define HOST_DTC_INSTALL_CMDS
-	$(HOST_CONFIGURE_OPTS) $(MAKE) -C $(@D) PREFIX=$(HOST_DIR) install-bin
+	$(HOST_CONFIGURE_OPTS) $(MAKE) -C $(@D) PREFIX=$(HOST_DIR) install
 endef
 
 $(eval $(generic-package))