x86: Rename existing FSP code to fsp1

Since there is now a new version of the FSP and it is incompatible with
the existing version, move the code into an fsp1 directory. This will
allow us to put FSP v2 code into an fsp2 directory.

Add a Kconfig which defines which version is in use.

Some of the code in this new fsp1/ directory is generic across both FSPv1
and FSPv2. Future patches will address this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/baytrail/acpi.c b/arch/x86/cpu/baytrail/acpi.c
index 445e4ba..1e3829a 100644
--- a/arch/x86/cpu/baytrail/acpi.c
+++ b/arch/x86/cpu/baytrail/acpi.c
@@ -167,7 +167,7 @@
  * and PMC_BASE_ADDRESS are accessed, so we need make sure the base addresses
  * of these two blocks are programmed by either U-Boot or FSP.
  *
- * It has been verified that 1st phase API (see arch/x86/lib/fsp/fsp_car.S)
+ * It has been verified that 1st phase API (see arch/x86/lib/fsp1/fsp_car.S)
  * on Intel BayTrail SoC already initializes these two base addresses so
  * we are safe to access these registers here.
  */