imx: move get_boot_device to common header

Most i.MX implements get_boot_device, move it to common header to
simplify code

Signed-off-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 6f1fc8f..d38f606 100644
--- a/arch/arm/include/asm/arch-imx8/sys_proto.h
+++ b/arch/arm/include/asm/arch-imx8/sys_proto.h
@@ -23,7 +23,6 @@
 
 extern unsigned long boot_pointer[];
 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);
 int imx8_power_domain_lookup_name(const char *name,
diff --git a/arch/arm/include/asm/arch-imx8m/sys_proto.h b/arch/arm/include/asm/arch-imx8m/sys_proto.h
index d328542..f8854e7 100644
--- a/arch/arm/include/asm/arch-imx8m/sys_proto.h
+++ b/arch/arm/include/asm/arch-imx8m/sys_proto.h
@@ -12,6 +12,5 @@
 void enable_tzc380(void);
 void restore_boot_params(void);
 extern unsigned long rom_pointer[];
-enum boot_device get_boot_device(void);
 bool is_usb_boot(void);
 #endif
diff --git a/arch/arm/include/asm/arch-imx8ulp/sys_proto.h b/arch/arm/include/asm/arch-imx8ulp/sys_proto.h
index 5f030ea..05859df 100644
--- a/arch/arm/include/asm/arch-imx8ulp/sys_proto.h
+++ b/arch/arm/include/asm/arch-imx8ulp/sys_proto.h
@@ -15,7 +15,6 @@
 enum bt_mode get_boot_mode(void);
 int xrdc_config_pdac(u32 bridge, u32 index, u32 dom, u32 perm);
 int xrdc_config_pdac_openacc(u32 bridge, u32 index);
-enum boot_device get_boot_device(void);
 void set_lpav_qos(void);
 void load_lposc_fuse(void);
 bool m33_image_booted(void);
diff --git a/arch/arm/include/asm/arch-mx7/sys_proto.h b/arch/arm/include/asm/arch-mx7/sys_proto.h
index e46a021..634736c 100644
--- a/arch/arm/include/asm/arch-mx7/sys_proto.h
+++ b/arch/arm/include/asm/arch-mx7/sys_proto.h
@@ -8,6 +8,5 @@
 #include <asm/mach-imx/sys_proto.h>
 
 void set_wdog_reset(struct wdog_regs *wdog);
-enum boot_device get_boot_device(void);
 
 #endif /* __SYS_PROTO_IMX7_ */
diff --git a/arch/arm/include/asm/arch-mx7ulp/sys_proto.h b/arch/arm/include/asm/arch-mx7ulp/sys_proto.h
index 0daa922..7adf472 100644
--- a/arch/arm/include/asm/arch-mx7ulp/sys_proto.h
+++ b/arch/arm/include/asm/arch-mx7ulp/sys_proto.h
@@ -8,5 +8,4 @@
 
 #include <asm/mach-imx/sys_proto.h>
 
-enum boot_device get_boot_device(void);
 #endif
diff --git a/arch/arm/include/asm/mach-imx/sys_proto.h b/arch/arm/include/asm/mach-imx/sys_proto.h
index 3095214..4b43cbc 100644
--- a/arch/arm/include/asm/mach-imx/sys_proto.h
+++ b/arch/arm/include/asm/mach-imx/sys_proto.h
@@ -246,4 +246,6 @@
 void enable_ca7_smp(void);
 #endif
 
+enum boot_device get_boot_device(void);
+
 #endif