x86: qemu: Move Cache-As-RAM memory from area mapped to ROM

ROM has been made read-only in qemu recently (namely commit 208fa0e4:
"pc: make 'pc.rom' readonly when machine has PCI enabled"). So this
patch restores compatibility between U-Boot and qemu.

Signed-off-by: Anton Gerasimov <anton@advancedtelematic.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: mention qemu commit title in the commit message]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/qemu/Kconfig b/arch/x86/cpu/qemu/Kconfig
index da37812..81444f3 100644
--- a/arch/x86/cpu/qemu/Kconfig
+++ b/arch/x86/cpu/qemu/Kconfig
@@ -18,7 +18,7 @@
 
 config SYS_CAR_ADDR
 	hex
-	default 0xd0000
+	default 0x10000
 
 config SYS_CAR_SIZE
 	hex