arm: zynq: spl: fix FPGA initialization

commit 4aba5fb857c1 ("arm: zynq: Rework FPGA initialization")
moved FPGA initialization from board_init() to arch_early_init_r(),
which is not called as part of the SPL

Fix this by calling arch_early_init_r() in the spl_board_init()
function, so the FPGA is correctly initialized

Signed-off-by: Luis Araneda <luaraneda@gmail.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/mach-zynq/spl.c

@@ -29,6 +29,9 @@ void board_init_f(ulong dummy)
 void spl_board_init(void)
 {
 	preloader_console_init();
+#if defined(CONFIG_ARCH_EARLY_INIT_R) && defined(CONFIG_SPL_FPGA_SUPPORT)
+	arch_early_init_r();
+#endif
 	board_init();
 }
 #endif