Change in coreboot[master]: volteer: set GSPI CS to deasserted by default

[9elements QA (Code Review)]

9elements QA has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/45384 )

Change subject: volteer: set GSPI CS to deasserted by default
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Patch Set 3:

Automatic boot test returned (PASS/FAIL/TOTAL): 8/1/9
"QEMU x86 q35/ich9" (x86_32) using payload TianoCore : SUCCESS : https://lava.9esec.io/r/20292
"QEMU x86 q35/ich9" (x86_32) using payload SeaBIOS : SUCCESS : https://lava.9esec.io/r/20291
"QEMU x86 i440fx/piix4" (x86_64) using payload SeaBIOS : FAIL : https://lava.9esec.io/r/20290
"QEMU x86 i440fx/piix4" (x86_32) using payload SeaBIOS : SUCCESS : https://lava.9esec.io/r/20289
"QEMU AArch64" using payload LinuxBoot_u-root_kexec : SUCCESS : https://lava.9esec.io/r/20288
"HP Z220 SFF Workstation" (x86_32) using payload LinuxBoot_BusyBox_kexec : SUCCESS : https://lava.9esec.io/r/20296
"HP Z220 SFF Workstation" (x86_32) using payload LinuxBoot_BusyBox_kexec : SUCCESS : https://lava.9esec.io/r/20295
"HP Compaq 8200 Elite SFF PC" (x86_32) using payload TianoCore : SUCCESS : https://lava.9esec.io/r/20294
"HP Compaq 8200 Elite SFF PC" (x86_32) using payload SeaBIOS : SUCCESS : https://lava.9esec.io/r/20293

Please note: This test is under development and might not be accurate at all!