util/ifdtool: Use Pch Strap Length(PSL) to uniquely identify IFDv2 chipsets

This patch fixes issue reported with CB:44815, where ifdtool is unable
to identify Lynx Point and Alder Lake chipsets. Hence, this patch make
below changes to fix this issue proper:
1. Refactor chipset name macros to identify chipets more accurately,
example: CNP, ICP and JSL chipsets macros are not seperated with proper
naming.
2. Use offset FLMAP1 bit 24:31, called PSL (PCH Strap Lenth) to uniquely
identify the chipsets without any additional logic.
Note: The same offset was known as ISL in IFDv1 hence, used the backward
compatibility without additional complexity.
+---------+-----------+
| Chipset | PSL Value |
+---------+-----------+
| APL/GLK | 0x13      |
+---------+-----------+
| JSL     | 0x2a      |
+---------+-----------+
| CNP     | 0x45      |
+---------+-----------+
| TGP/ADP | 0x46      |
+---------+-----------+
| ICP     | 0x4a      |
+---------+-----------+
3. Remove unused argument 1 from guess_ich_chipset() function.

BUG=b:153888802
TEST=Able to dump FD contains correctly without specifying platform
quirks on Brya Platform.
> ifdtool -d coreboot.rom
Without this CL :
PCH Revision: 100/200 series Sunrise Point
With this CL :
PCH Revision: 500 series Tiger Point/ 600 series Alder Point

Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Change-Id: I25f69ce775454409974056d8326c02e29038ec8a
---
M util/ifdtool/ifdtool.c
M util/ifdtool/ifdtool.h
2 files changed, 37 insertions(+), 26 deletions(-)