[patch] PCI class test for VGA

[Ronald Hoogenboom]

Hi,

In pci_device.c, the class for VGA was not tested properly, leading to
no VGA output from coreboot, even after the boot-rom was executed
properly (CONFIG_PCI_ROM_RUN) or no boot-rom execution with
CONFIG_VGA_ROM_RUN at all. According to the header file device.h, the
class field of struct device is '3 bytes: (base,sub,prog-if)'.

Signed-off-by: Ronald Hoogenboom