Change in coreboot[master]: drivers/intel/gma: Restructure Opregion version info code

[Subrata Banik (Code Review)]

Attention is currently required from: Tim Wawrzynczak, Meera Ravindranath, Angel Pons, Patrick Rudolph.
Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56168 )

Change subject: drivers/intel/gma: Restructure Opregion version info code
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Patch Set 9:

(1 comment)

File src/drivers/intel/gma/opregion.c:

https://review.coreboot.org/c/coreboot/+/56168/comment/65f834ad_90afef24 
PS6, Line 261: 2
> > Hi Angel/Subrata, […]

This is my concern, anytime someone adding 3.0 support, we need to come and add those value here. along with new Kconfig to claim support for 3.0. But had option that, 3.0 Kconfig itself would be enough to auto select the version Kconfig and this code would just return the struct opregion_version without any hardcoding. But really don't want to be blocker here and if we agree that this is the best way, lets continue.

/* Function to get the IGD Opregion version */
static struct opregion_version opregion_get_version(void)
{
    if (CONFIG(INTEL_GMA_OPREGION_2_1))
    	return (struct opregion_version) { .major = 2, .minor = 1 };

return (struct opregion_version) { .major = 2, .minor = 0 };
}