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]
diff --git a/drivers/serial/serial_mtk.c b/drivers/serial/serial_mtk.c
index a84f39b..22251c5 100644
--- a/drivers/serial/serial_mtk.c
+++ b/drivers/serial/serial_mtk.c
@@ -141,7 +141,7 @@
 	writel(ch, &priv->regs->thr);
 
 	if (ch == '\n')
-		WATCHDOG_RESET();
+		schedule();
 
 	return 0;
 }
@@ -295,7 +295,7 @@
 		do { \
 			err = _mtk_serial_getc(&mtk_hsuart##port); \
 			if (err == -EAGAIN) \
-				WATCHDOG_RESET(); \
+				schedule(); \
 		} while (err == -EAGAIN); \
 		return err >= 0 ? err : 0; \
 	} \