Change in coreboot[master]: mb/*: devicetree: drop now unneeded USBx_PORT_EMPTY

[9elements QA (Code Review)]

9elements QA has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/45125 )

Change subject: mb/*: devicetree: drop now unneeded USBx_PORT_EMPTY
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Patch Set 3:

Automatic boot test returned (PASS/FAIL/TOTAL): 7/1/8
"QEMU x86 q35/ich9" (x86_32) using payload TianoCore : SUCCESS : https://lava.9esec.io/r/17871
"QEMU x86 q35/ich9" (x86_32) using payload SeaBIOS : SUCCESS : https://lava.9esec.io/r/17870
"QEMU x86 i440fx/piix4" (x86_64) using payload SeaBIOS : FAIL : https://lava.9esec.io/r/17869
"QEMU x86 i440fx/piix4" (x86_32) using payload SeaBIOS : SUCCESS : https://lava.9esec.io/r/17868
"QEMU AArch64" using payload LinuxBoot_u-root_kexec : SUCCESS : https://lava.9esec.io/r/17867
"HP Z220 SFF Workstation" (x86_32) using payload LinuxBoot_BusyBox_kexec : SUCCESS : https://lava.9esec.io/r/17874
"HP Compaq 8200 Elite SFF PC" (x86_32) using payload TianoCore : SUCCESS : https://lava.9esec.io/r/17873
"HP Compaq 8200 Elite SFF PC" (x86_32) using payload SeaBIOS : SUCCESS : https://lava.9esec.io/r/17872

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