Change in coreboot[master]: soc/intel/common: add generic gpio lock mechanism

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Bora Guvendik, Caveh Jalali, Selma Bensaid, Maulik V Vaghela, Subrata Banik, Nick Vaccaro, Patrick Rudolph, Karthik Ramasubramanian.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/58351 )

Change subject: soc/intel/common: add generic gpio lock mechanism
......................................................................

Patch Set 7:

(2 comments)

File src/soc/intel/common/block/smm/smihandler.c:

https://review.coreboot.org/c/coreboot/+/58351/comment/0786c846_2d10bf7d 
PS7, Line 333: exit if SoC does not export a list
this doesn't look true?

https://review.coreboot.org/c/coreboot/+/58351/comment/e17c0fc9_50fb654c 
PS7, Line 328: 	const struct gpio_lock_config *soc_gpios;
             : 	const struct gpio_lock_config *mb_gpios;
             : 	size_t soc_gpio_num;
             : 	size_t mb_gpio_num;
             : 
             : 	/* get list of gpios from SoC, exit if SoC does not export a list */
             : 	soc_gpios = soc_gpio_lock_config(&soc_gpio_num);
             : 
             : 	/* get list of gpios from mainboard, it's ok if mb does not export a list */
             : 	mb_gpios = mb_gpio_lock_config(&mb_gpio_num);
             : 
             : 	/* Lock all mainboard and soc requested gpios */
             : 	gpio_lock_multiple_pads(soc_gpios, soc_gpio_num, mb_gpios, mb_gpio_num);
so you could just use malloc() here to allocate a list long enough to store both and not have the awkward API

```
    const struct gpio_lock_config *soc_gpios;
    const struct gpio_lock_config *mb_gpios;
    size_t soc_gpio_num;
    size_t mb_gpio_num;

soc_gpios = soc_gpio_lock_config(&soc_gpio_num);
    mb_gpios = mb_gpio_lock_config(&mb_gpio_num);
        const size_t total_num = soc_gpio_num + mb_gpio_num;
        const struct gpio_lock_config *all_gpios = malloc(sizeof(*all_gpios) * total_num);

memcpy(all_gpios, soc_gpios, sizeof(*soc_gpios) * soc_gpio_num);
        memcpy(all_gpios + soc_gpio_num, mb_gpios, sizeof(*mb_gpios) * mb_gpio_num);

/* Lock all mainboard and soc requested gpios */
    gpio_lock_pads(all_gpios, total_num);
```