Skip kernel-irqchip=off when installing with --install-from-img

Move the setting from qemu/windows11-darwin-arm64.ini to a -machine option
that run-windows11.py adds on macOS arm64 unless --install-from-img is given.
The workaround is only needed for usb-storage, which the NVMe install disk
does not use, and Setup hangs with the emulated interrupt controller.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

qemu/windows11-darwin-arm64.ini

@@ -7,13 +7,10 @@
 [accel]
   accel = "tcg"
 
-# With the HVF in-kernel GICv3, QEMU's usb-storage races on the status packet
-# and Windows Setup stalls 10 s after every burst of reads (utmapp/UTM#7970),
-# so use the emulated interrupt controller; upstream QEMU only gets the fix
-# from the UTM fork.
+# run-windows11.py adds kernel-irqchip=off unless installing with
+# --install-from-img (see there).
 [machine]
   type = "virt"
-  kernel-irqchip = "off"
 
 # The "virt" machine has no IDE. NVMe and USB mass storage (used by the
 # installation media of --install-from-iso) both have inbox Windows drivers.