apply-patches.sh: use series file to apply patches in proper order

If a series file is present use it to determine the proper order to apply
patches instead of using ls sorting order.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Tested-by: Ludovic Desroches <ludovic.desroches@atmel.com>
add a series file with a wrong patch order into an archive containing several
patches whose correct order is the alphabetical one
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>