watchdog: Add booke watchdog driver

Add a driver for the PowerPC Book E watchdog driver that is present on a
number of Freescale/NXP SoCs.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 6e70c7a..5c7ef59 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -21,6 +21,7 @@
 obj-$(CONFIG_WDT_ASPEED) += ast_wdt.o
 obj-$(CONFIG_WDT_AST2600) += ast2600_wdt.o
 obj-$(CONFIG_WDT_BCM6345) += bcm6345_wdt.o
+obj-$(CONFIG_WDT_BOOKE) += booke_wdt.o
 obj-$(CONFIG_WDT_CORTINA) += cortina_wdt.o
 obj-$(CONFIG_WDT_ORION) += orion_wdt.o
 obj-$(CONFIG_WDT_CDNS) += cdns_wdt.o