arm64: zynqmp: Call psu_init from board_early_init_f

For some mini platforms there could be a need to include psu_init.
That's why move it to board file instead of spl only file.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/cpu/armv8/zynqmp/spl.c b/arch/arm/cpu/armv8/zynqmp/spl.c
index 26bf80e..468dc1d 100644
--- a/arch/arm/cpu/armv8/zynqmp/spl.c
+++ b/arch/arm/cpu/armv8/zynqmp/spl.c
@@ -17,7 +17,7 @@
 
 void board_init_f(ulong dummy)
 {
-	psu_init();
+	board_early_init_f();
 	board_early_init_r();
 
 #ifdef CONFIG_DEBUG_UART