cyclic: Use schedule() instead of WATCHDOG_RESET()

Globally replace all occurances of WATCHDOG_RESET() with schedule(),
which handles the HW_WATCHDOG functionality and the cyclic
infrastructure.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Tom Rini <trini@konsulko.com> [am335x_evm, mx6cuboxi, rpi_3,dra7xx_evm, pine64_plus, am65x_evm, j721e_evm]

cmd/fastboot.c

@@ -76,7 +76,7 @@ static int do_fastboot_usb(int argc, char *const argv[],
 			break;
 		if (ctrlc())
 			break;
-		WATCHDOG_RESET();
+		schedule();
 		usb_gadget_handle_interrupts(controller_index);
 	}