[ARM] omap3: Lookup device tree nodes using compatible string

Signed-off-by: Anup Patel <anup@brainfault.org>
Merge remote-tracking branch 'upstream/master' into dev_exynos4
[ARM] Exynos4: Lookup device tree nodes using compatible string

Signed-off-by: Jean-Christophe DUBOIS <jcd@tribudubois.net>