Remove duplicate code in cpu/arm926ejs/davinci/lxt972.c.

Remove duplicate code in a if/else block in
cpu/arm926ejs/davinci/lxt972.c.
Fixed style issues.
Signed-off-by: NHugo Villeneuve <hugo.villeneuve@lyrtech.com>
Signed-off-by: NBen Warren <biggerbadderben@gmail.com>