fastboot: lift restrictions on !NET_LWIP for USB

Fastboot works either over TCP, UDP or USB. The latter doesn't have
anything to do with networking, thus should work just fine with
regardless which network stack is selected. In practice, header symbols
are used inside common code paths. Add some ifdeffery to guard against
that.

This will make fastboot over USB work with the new LWIP stack.

Signed-off-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20250312073655.2281377-1-mwalle@kernel.org
Signed-off-by: Mattijs Korpershoek <mkorpershoek@kernel.org>

cmd/fastboot.c

@@ -16,6 +16,7 @@
 #include <linux/printk.h>
 #include <linux/stringify.h>
 
+#if CONFIG_IS_ENABLED(NET)
 static int do_fastboot_udp(int argc, char *const argv[],
 			   uintptr_t buf_addr, size_t buf_size)
 {
@@ -55,6 +56,7 @@ static int do_fastboot_tcp(int argc, char *const argv[],
 
 	return CMD_RET_SUCCESS;
 }
+#endif
 
 static int do_fastboot_usb(int argc, char *const argv[],
 			   uintptr_t buf_addr, size_t buf_size)
@@ -160,10 +162,12 @@ NXTARG:
 
 	fastboot_init((void *)buf_addr, buf_size);
 
+#if CONFIG_IS_ENABLED(NET)
 	if (!strcmp(argv[1], "udp"))
 		return do_fastboot_udp(argc, argv, buf_addr, buf_size);
 	if (!strcmp(argv[1], "tcp"))
 		return do_fastboot_tcp(argc, argv, buf_addr, buf_size);
+#endif
 	if (!strcmp(argv[1], "usb")) {
 		argv++;
 		argc--;

drivers/fastboot/Kconfig

@@ -1,6 +1,5 @@
 menu "Fastboot support"
 	depends on CMDLINE
-	depends on !NET_LWIP
 
 config FASTBOOT
 	bool

drivers/fastboot/fb_common.c

@@ -183,11 +183,15 @@ void fastboot_handle_boot(int command, bool success)
 	switch (command) {
 	case FASTBOOT_COMMAND_BOOT:
 		fastboot_boot();
+#if CONFIG_IS_ENABLED(NET)
 		net_set_state(NETLOOP_SUCCESS);
+#endif
 		break;
 
 	case FASTBOOT_COMMAND_CONTINUE:
+#if CONFIG_IS_ENABLED(NET)
 		net_set_state(NETLOOP_SUCCESS);
+#endif
 		break;
 
 	case FASTBOOT_COMMAND_REBOOT: