Change in coreboot[master]: util/intelp2m: Add support for Alder Lake macro generation

[Maxim Polyakov (Code Review)]

Attention is currently required from: Michał Żygowski, Michał Kopeć, Angel Pons.
Maxim Polyakov has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63403 )

Change subject: util/intelp2m: Add support for Alder Lake macro generation
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Patch Set 4:

(1 comment)

File util/intelp2m/parser/parser.go:

https://review.coreboot.org/c/coreboot/+/63403/comment/eb36233f_0b7cbadf 
PS4, Line 152: cnl.PlatformSpecific{}
snr.PlatformSpecific{} in the previous patch was right

An interface in go is a pointer that will be null if you don't initialize it.
If so, we have an attempt to dereference a null pointer here -
https://github.com/coreboot/coreboot/blob/master/util/intelp2m/platforms/cnl...
and here 
https://github.com/coreboot/coreboot/blob/master/util/intelp2m/platforms/cnl...

The PlatformSpecific structure for the "cnl" package includes two such pointers, one of which you initialized in util/intelp2m/platforms/adl/macro.go. The second interface for reusing KeywordCheck() is initialized here

config.AlderType: adl.PlatformSpecific{
    		InheritanceTemplate: cnl.PlatformSpecific{
    			InheritanceTemplate: snr.PlatformSpecific{},
    		},
    	},

But this makes no sense, since both "cnl" and "snr" use the same KeywordCheck() function. Therefore, for the cleanliness of the code, we use KeywordCheck() from the "snr" package.

config.AlderType: adl.PlatformSpecific{
    			InheritanceTemplate: snr.PlatformSpecific{},
    	},

snr.PlatformSpecific{} doesn't have these interfaces, because it does not use code from another platform - https://github.com/coreboot/coreboot/blob/master/util/intelp2m/platforms/snr...

intelp2m$ make
go version
go version go1.18 linux/amd64
GO111MODULE=off go build -v -o intelp2m

intelp2m$ ./intelp2m -file inteltool-examples/inteltool-adl.log -iiii -fld cb -p adl -o gpio_adl_h.h
Info level: Use level 4!
Log file: inteltool-examples/inteltool-adl.log
Output generated file: gpio_adl_h.h
Parse IntelTool Log File...
...done!