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>

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

board/xilinx/zynqmp/zynqmp.c

@@ -118,6 +118,11 @@ int board_early_init_f(void)
 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_CLK_ZYNQMP)
 	zynqmp_pmufw_version();
 #endif
+
+#if defined(CONFIG_SPL_BUILD)
+	psu_init();
+#endif
+
 	return 0;
 }