Introduce n810's lp5521 LED driver.

Signed-off-by: Mathias Nyman <mathias.nyman@nokia.com

Updated to new style i2c driver and to build on current
linux-omap head.
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>