[Meego-kernel] mid_keypad: support different matrix and behavior

[Jekyll_Lai at wistron.com]

It's a general case that one platform uses different keypad matrix to
support different projects. In the case of mid_keypad driver, we would
like to add subvendor id to distinguish which keypad will be used.
Keypad driver get pci_device_id infomation from PCI shim data which
filled by IA32-fw. Could we use this mechanism to add kinds of keypad
support via PCI shim? Is this proposal appropriate to meego and mid?

#define SUBVENDOR_CDK 0
#define SUBVENDOR_MM 1

#define SUBDEVICE_7INCH 0
#define SUBDEVICE_10INCH 1

static struct pci_device_id keypad_pci_tbl[] = {
	{0x8086, 0x0805, SUBVENDOR_CDK, PCI_ANY_ID, 0, 0, 0 },
	{0x8086, 0x0805, SUBVENDOR_MM, SUBDEVICE_7INCH, 0, 0, 0 },
	{0x8086, 0x0805, SUBVENDOR_MM, SUBDEVICE_10INCH, 0, 0, 0 },
	{0,}
};