Change in coreboot[master]: soc/intel/{adl,tgl,jsl}: Add smihandler_soc_disable_busmaster

[Kane Chen (Code Review)]

Attention is currently required from: Furquan Shaikh, Tim Wawrzynczak, Kane Chen, Karthik Ramasubramanian.
Kane Chen has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52873 )

Change subject: soc/intel/{adl,tgl,jsl}: Add smihandler_soc_disable_busmaster
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Patch Set 5:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/52873/comment/f4f09459_d08c548a 
PS4, Line 7: soc/intel/{adl, tgl, jsl}: Don't disable bus master on PMC device in sleep smi
           : 
           : We found system hang if the shutdown is triggered before fsps.
           : This is due to the io decode enable on pmc is disabled by
           : busmaster_disable_on_bus function.
           : Hence, the slp_en on acpi pm1_cnt register doesn't succeed.
           : So this change skip pmc bus disable before shutdown.
           : 
           : The reason issue is not reproduced after fsps is beacause pmc pci
           : device is hidden after fsps.
           : That's why busmaster_disable_on_bus won't clear io deocde on pmc device.
> suggestion: […]

thanks for your suggestion. 
i've changed the commit msg.