x86: kconfig: Hide "System tables" for EFI

Instead of hiding each menu entries under "System tables" for EFI,
hide the main menu completely.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/Kconfig

@@ -307,10 +307,10 @@ config VGA_BIOS_ADDR
 	  0x90000 from the beginning of a 1MB flash device.
 
 menu "System tables"
+	depends on !EFI
 
 config GENERATE_PIRQ_TABLE
 	bool "Generate a PIRQ table"
-	depends on !EFI
 	default n
 	help
 	  Generate a PIRQ routing table for this board. The PIRQ routing table
@@ -321,7 +321,6 @@ config GENERATE_PIRQ_TABLE
 
 config GENERATE_SFI_TABLE
 	bool "Generate a SFI (Simple Firmware Interface) table"
-	depends on !EFI
 	help
 	  The Simple Firmware Interface (SFI) provides a lightweight method
 	  for platform firmware to pass information to the operating system
@@ -336,7 +335,6 @@ config GENERATE_SFI_TABLE
 
 config GENERATE_MP_TABLE
 	bool "Generate an MP (Multi-Processor) table"
-	depends on !EFI
 	default n
 	help
 	  Generate an MP (Multi-Processor) table for this board. The MP table