Fix tools/boot/ci-qemu-test.sh and make some improvements

Update ci-qemu-test.sh

o Update the path to the OVMF file, which is now in /usr/local/share/uefi-edk2-qemu.
o Use the more modern q35, pc-q35-3.0 (Q35 + ICH9, 2009) QEMU machine
  instead of the default, obsolete pc, pc-i440fx-3.0 (i440FX + PIIX, 1996).
  For example this adds ACPI support.
o Specify the system firmware using the newer pflash drive syntax instead
  of bios.
o Remove extra, unneeded devices by passing -nodefaults.
o Change text to talk about 'firmware' instead of 'bios', since UEFI
  isn't a BIOS.

Reviewed by:	imp, emaste
Differential Revision:	https://reviews.freebsd.org/D20074

tools/boot/ci-qemu-test.sh

@@ -81,10 +81,10 @@ if [ -z "${SRCTOP}" ]; then
 	die "Cannot locate top of source tree"
 fi
 
-# Locate the uefi bios file used by qemu.
-: ${OVMF:=/usr/local/share/UEFI-firmware/QEMU_UEFI_CODE_x86_64.fd}
+# Locate the uefi firmware file used by qemu.
+: ${OVMF:=/usr/local/share/uefi-edk2-qemu/QEMU_UEFI_CODE-x86_64.fd}
 if [ ! -r "${OVMF}" ]; then
-	die "Cannot read UEFI bios file ${OVMF}"
+	die "Cannot read UEFI firmware file ${OVMF}"
 fi
 
 # Create a temp dir to hold the boot image.
@@ -97,7 +97,8 @@ trap tempdir_cleanup EXIT SIGINT SIGHUP SIGTERM SIGQUIT
 # And, boot in QEMU.
 : ${BOOTLOG:=${TMPDIR:-/tmp}/ci-qemu-test-boot.log}
 timeout 300 \
-    qemu-system-x86_64 -m 256M -bios ${OVMF} \
+    qemu-system-x86_64 -M q35 -m 256M -nodefaults \
+   	-drive if=pflash,format=raw,readonly,file=${OVMF} \
         -serial stdio -vga none -nographic -monitor none \
         -snapshot -hda fat:${ROOTDIR} 2>&1 | tee ${BOOTLOG}