Change default print media size from JIS_B5 to ISO_A4 for Japanese

The Japanese government sat the new rule for a business document
from B5 to A4 from Aprial/1993. Currently, A4 is a common print paper
size in Japan.
However, the current *Android* default media size in Japan is JIS_B5.
Maybe this default media size is based on the old Japanese standard
information.

MHLW formally adopted it in 1993(but in Japanese)
https://www.mhlw.go.jp/web/t_doc?dataId=00ta0034&dataType=1&pageNo=1



Test: Change Languages to Japanese(Nippon), Tap "Print" in Gmail or Chrome and check Paper size(before test this, remove all favorite printers).
Change-Id: I2748bc76d5b7143b99d21e07e8c5c44f87246c84
Signed-off-by: Yoshiro MIHIRA <sanpei@sanpei.org>