zynqmp: firmware: Add Xilinx ZynqMP firmware driver

Add simple ZynqMP firmware drive to populate child nodes under
zynqmp_firmware DT node.

Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 95fe0ae..305cbd9 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -113,6 +113,7 @@
 config CLK_ZYNQMP
 	bool "Enable clock driver support for ZynqMP"
 	depends on ARCH_ZYNQMP
+	select ZYNQMP_FIRMWARE
 	help
 	  This clock driver adds support for clock realted settings for
 	  ZynqMP platform.