x86: fsp: Enlarge the size of malloc() pool before relocation

After fsp_init() returns, the stack has already been switched to a
place within system memory as defined by CONFIG_FSP_TEMP_RAM_ADDR.
Enlarge the size of malloc() pool before relocation since we have
plenty of memory now.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 065bbe4..687208f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -232,6 +232,13 @@
 	  Stack top address which is used in FspInit after DRAM is ready and
 	  CAR is disabled.
 
+config FSP_SYS_MALLOC_F_LEN
+	hex
+	depends on HAVE_FSP
+	default 0x100000
+	help
+	  Additional size of malloc() pool before relocation.
+
 config SMP
 	bool "Enable Symmetric Multiprocessing"
 	default n