soc/intel/xeon_sp: Move codes to support new PCH

Different PCHs have different definitions for registers. Here create
a lbg folder and move lbg specific codes to this folder so that we
can add new PCH code under xeon_sp folder.

* Create lbg folder and move lbg specific codes from pch.c to soc_pch.c
  under lbg folder.
* Rename lewisburg_pch_gpio_defs.h to gpio_soc_defs.h and move to lbg
  folder.
* Rename gpio.c to soc_gpio.c and move to lbg folder.
* Move pcr_ids.h to lbg folder.
* Move lbg specific codes from pmutil.c to soc_pmutil.c under lbg
  folder.
* Create and revise makefile for files under lbg folder.

TEST=Can boot into OS on OCP Delta Lake.

Signed-off-by: Tim Chu <Tim.Chu@quantatw.com>
Change-Id: I06555ed6612c632ea2ce1938d81781cd9348017a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70009
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

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