Change email account for unicore32 arch and pkunity soc drivers
Since old email server mprc.pku.edu.cn was blocked in recent years
Signed-off-by: NGuan Xuetao <gxt@pku.edu.cn>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>