Separate out 3430 LCD panel support from 2430 SDP.

Currently the support for the LCD on 3430SDP is added in the lcd_2430sdp.c
file. This patch separates it out to a new file.
Signed-off-by: Iqbal Shareef  <iqbal@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>