x86: kconfig: Make FSP_TEMP_RAM_ADDR depend on HAVE_FSP

FSP_TEMP_RAM_ADDR should only be visible when HAVE_FSP is on.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

arch/x86/Kconfig

@@ -220,6 +220,7 @@ config FSP_ADDR
 
 config FSP_TEMP_RAM_ADDR
 	hex
+	depends on HAVE_FSP
 	default 0x2000000
 	help
 	  Stack top address which is used in FspInit after DRAM is ready and