Increase default CONFIG_MAX_BIOSTABLE setting.

In an smp simulation, the smbios/mptable need more space than was allocated.
diff --git a/src/config.h b/src/config.h
index 7b62faf..ac99dae 100644
--- a/src/config.h
+++ b/src/config.h
@@ -81,7 +81,7 @@
 // Maximum number of map entries in the e820 map
 #define CONFIG_MAX_E820 32
 // Space to reserve in f-segment for run-time built bios tables.
-#define CONFIG_MAX_BIOSTABLE 512
+#define CONFIG_MAX_BIOSTABLE 2048
 
 #define CONFIG_MAX_ATA_INTERFACES 4
 #define CONFIG_MAX_ATA_DEVICES  (CONFIG_MAX_ATA_INTERFACES*2)