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/boot/image-board.c b/boot/image-board.c
index 1be0a35..98f903f 100644
--- a/boot/image-board.c
+++ b/boot/image-board.c
@@ -181,7 +181,7 @@
 		while (len > 0) {
 			size_t tail = (len > chunksz) ? chunksz : len;
 
-			WATCHDOG_RESET();
+			schedule();
 			if (to > from) {
 				to -= tail;
 				from -= tail;