arm64: zynqmp: Add support for new power-management node name

zynqmp-power node is going to be renamed to power-management which should
be generic enough. New name came from dt-binding review that's why there is
no way around. Add support new name but also at the same time check old
name just in case older dt binding is used.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/967aa76f9f72604c874b580476aa85f5260ccd65.1704448544.git.michal.simek@amd.com
diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c
index e3700f0..9f50090 100644
--- a/board/xilinx/zynqmp/zynqmp.c
+++ b/board/xilinx/zynqmp/zynqmp.c
@@ -156,9 +156,12 @@
 #if defined(CONFIG_ZYNQMP_FIRMWARE)
 	struct udevice *dev;
 
-	uclass_get_device_by_name(UCLASS_FIRMWARE, "zynqmp-power", &dev);
-	if (!dev)
-		panic("PMU Firmware device not found - Enable it");
+	uclass_get_device_by_name(UCLASS_FIRMWARE, "power-management", &dev);
+	if (!dev) {
+		uclass_get_device_by_name(UCLASS_FIRMWARE, "zynqmp-power", &dev);
+		if (!dev)
+			panic("PMU Firmware device not found - Enable it");
+	}
 #endif
 
 #if defined(CONFIG_SPL_BUILD)