x86: kconfig: Hide "System tables" for coreboot

When booting as a coreboot payload, we don't need write any
configuration tables as coreboot does that for us.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b600beb..065bbe4 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -307,7 +307,7 @@
 	  0x90000 from the beginning of a 1MB flash device.
 
 menu "System tables"
-	depends on !EFI
+	depends on !EFI && !SYS_COREBOOT
 
 config GENERATE_PIRQ_TABLE
 	bool "Generate a PIRQ table"