mb/emulation/qemu-q35: Enable user option table support

It’s unclear why this option was commented out. Activate the line, and
copy the CMOS layout and defaults from qemu-i440fx.

TEST=Boot 2.11.1(Debian 1:2.11+dfsg-1ubuntu7) and see that nvramcui
     works. A changed value doesn’t survive a reboot though.

Change-Id: Ieef86f092d323c68a6d2d0cc6c04c395f743a935
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-on: https://review.coreboot.org/26265
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/emulation/qemu-q35/Kconfig

@@ -5,7 +5,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select CPU_QEMU_X86
 	select SOUTHBRIDGE_INTEL_I82801IX
 	select IOAPIC_INTERRUPTS_ON_APIC_SERIAL_BUS
-#	select HAVE_OPTION_TABLE
+	select HAVE_OPTION_TABLE
 #	select HAVE_PIRQ_TABLE
 	select HAVE_ACPI_TABLES
 	select BOARD_ROMSIZE_KB_2048

src/mainboard/emulation/qemu-q35/cmos.default

@@ -0,0 +1,4 @@
+boot_option = Fallback
+power_on_after_fail = Enable
+debug_level = Spew
+ECC_memory = Disable

src/mainboard/emulation/qemu-q35/cmos.layout

@@ -0,0 +1,28 @@
+entries
+
+0          384       r       0        reserved_memory
+384          1       e       4        boot_option
+388          4       h       0        reboot_counter
+#392          3       r       0        unused
+400          1       e       1        power_on_after_fail
+412          4       e       6        debug_level
+456          1       e       1        ECC_memory
+1008         16      h       0        check_sum
+
+enumerations
+
+#ID value   text
+1     0     Disable
+1     1     Enable
+2     0     Enable
+2     1     Disable
+4     0     Fallback
+4     1     Normal
+6     5     Notice
+6     6     Info
+6     7     Debug
+6     8     Spew
+
+checksums
+
+checksum 392 1007 1008