arm: imx8: don't duplicate build_info()

Move build_info() to common place.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Cc: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/include/asm/arch-imx8/sys_proto.h b/arch/arm/include/asm/arch-imx8/sys_proto.h
index 3f5bbe9..b8d2a0b 100644
--- a/arch/arm/include/asm/arch-imx8/sys_proto.h
+++ b/arch/arm/include/asm/arch-imx8/sys_proto.h
@@ -16,6 +16,7 @@
 	u32 g_ap_mu;
 };
 
+void build_info(void);
 enum boot_device get_boot_device(void);
 int print_bootinfo(void);
 int sc_pm_setup_uart(sc_rsrc_t uart_rsrc, sc_pm_clock_rate_t clk_rate);