Fix compile error in GDISP

Fix compile error with wrongly named include file
Revert lld_gdisp naming convention to gdisp_lld to fix problem and be
consitant with all other low level drivers.
TDISP to take ROWS and COLUMNS from board file

TDISP to take ROWS and COLUMNS from board file
GADC implementation with demo program

Also includes driver for AT91SAM7 cpu