Add support for Intellimouse Mode in ALPS touchpad on Dell E2 series Laptops

Add support for Intellimouse Mode in ALPS touchpad on Dell E2 series Laptops

Resending modified patch to fix suspend/resume issues and restricting the
quirks to Dell portables only.

Dell E2 series laptops ( M4500, E6510, E6410 etc.) have ALPS touchpads
which are enabled by default as 3-byte generic PS/2 mouse mode. This
patch enables the 4-byte "Intellimouse Mode" ( e.g scrolling support).

Signed-off-by: Rezwanul_Kabir <Rezwanul_Kabir@dell.com>
BugLink: http://bugs.launchpad.net/bugs/632884
Signed-off-by: Andy Whitcroft <apw@canonical.com>