util/qemu: Revise q35 configs

Add an NVMe drive and be more conservative with hotplug-capable PCIe
ports. QEMU treats everything as hotpluggable by default, so devices
can be added at runtime. However, this leads to unrealistic resource
allocations with PCIEXP_HOTPLUG enabled.

Tested recent allocator changes with QEMU/Q35 config and:

  $ make qemu QEMU_EXTRA_CFGS=util/qemu/q35-alpine.cfg

Change-Id: I23746b642329356c6767b04ec177cd9411e3adb9
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67026
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>

util/qemu/q35-alpine.cfg

@@ -9,6 +9,7 @@
 		bus = "alpine-root"
 		addr = "00.0"
 		chassis = "10"
+		hotplug = "off"
 
 [device "alpine-nhi"]
 			driver = "pci-testdev"
@@ -21,6 +22,7 @@
 		bus = "alpine-root"
 		addr = "01.0"
 		chassis = "11"
+		hotplug = "off"
 
 [device "alpine-up"]
 			driver = "x3130-upstream"
@@ -48,6 +50,7 @@
 				bus = "alpine-up"
 				addr = "04.0"
 				chassis = "24"
+				hotplug = "off"
 
 [device "alpine-xhci"]
 					driver = "nec-usb-xhci"
@@ -59,3 +62,4 @@
 		bus = "alpine-root"
 		addr = "02.0"
 		chassis = "12"
+		hotplug = "off"