This commit replaces the loop copying out-of-tree DTS into the kernel tree by a make foreach loop instead of a shell for loop. This allows to error out if one of the DTS file cannot be copied (for example if it doesn't exist). Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>