realtek: mach: export soc_info

We do not want to rely on the soc_info structure. But at the moment
it is still referenced in several places. Add an EXPORT() to it.
So drivers that need access to this structure can be build as modules.

Suggested-by: Balázs Triszka <info@balika011.hu>
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/22121
Signed-off-by: Robert Marko <robimarko@gmail.com>

target/linux/realtek/files-6.12/arch/mips/rtl-otto/prom.c

@@ -39,6 +39,8 @@
 #define soc_w32(val, reg)		writel(val, RTL_SOC_BASE + reg)
 
 struct rtl83xx_soc_info soc_info;
+EXPORT_SYMBOL(soc_info);
+
 const void *fdt;
 
 static char rtl_soc_name[16];