Change in coreboot[master]: mb/intel/shadowmountain: Add the ASL code

[Subrata Banik (Code Review)]

Attention is currently required from: V Sowmya, Paul Menzel, Tim Wawrzynczak, Balaji Manigandan, Aamir Bohra.
Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49733 )

Change subject: mb/intel/shadowmountain: Add the ASL code
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Patch Set 3: Code-Review+2

(3 comments)

File src/mainboard/intel/shadowmountain/dsdt.asl:

https://review.coreboot.org/c/coreboot/+/49733/comment/505c0c1f_421f563a 
PS3, Line 19: // global NVS and variables
/* */

https://review.coreboot.org/c/coreboot/+/49733/comment/314f493c_3125499f 
PS3, Line 22: // CPU
/* */

https://review.coreboot.org/c/coreboot/+/49733/comment/760d978d_8b9c73d4 
PS3, Line 34: // Chrome OS Embedded Controller
/* */