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_bcm283x_mu.c b/drivers/serial/serial_bcm283x_mu.c
index f0756c3..493a42b 100644
--- a/drivers/serial/serial_bcm283x_mu.c
+++ b/drivers/serial/serial_bcm283x_mu.c
@@ -114,7 +114,7 @@
 	lsr = readl(&regs->lsr);
 
 	if (input) {
-		WATCHDOG_RESET();
+		schedule();
 		return (lsr & BCM283X_MU_LSR_RX_READY) ? 1 : 0;
 	} else {
 		return (lsr & BCM283X_MU_LSR_TX_IDLE) ? 0 : 1;