Add Japanese Photo L size

L size media is very common in Japan, as listed at
https://en.wikipedia.org/wiki/Photo_print_sizes

. DPS and other
print services must add their own definitions of this popular size.

Including it in PrintAttributes will allow other software to
leverage it instead of re-defining it, leading to a more consistent
experience in the future.

Test: L is present in API
Change-Id: I7022881846d1bf46bda80b4825c5cba01b794821
Signed-off-by: Glade Diviney <mopriadevteam@gmail.com>