zynq: Move zynq to clock framework

Move the zynq to clock framework and remove unused functions as well as
the CONFIG_ZYNQ_PS_CLK_FREQ configuration.

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 0229800..9b3869c 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -714,6 +714,9 @@
 	select SPL_SEPARATE_BSS if SPL
 	select DM_USB if USB
 	select BLK
+	select CLK
+	select SPL_CLK
+	select CLK_ZYNQ
 
 config ARCH_ZYNQMP
 	bool "Support Xilinx ZynqMP Platform"