rtc: add xilinx zynqmp rtc driver

Add support for RTC controller found on Xilinx Zynq Ultrascale+ MPSoC
platform.

Signed-off-by: Suneel Garapati <suneel.garapati@xilinx.com>
Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 2797384..e491eb5 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -159,3 +159,4 @@
 obj-$(CONFIG_RTC_DRV_WM8350)	+= rtc-wm8350.o
 obj-$(CONFIG_RTC_DRV_X1205)	+= rtc-x1205.o
 obj-$(CONFIG_RTC_DRV_XGENE)	+= rtc-xgene.o
+obj-$(CONFIG_RTC_DRV_ZYNQMP)	+= rtc-zynqmp.o