Here add maintainer information for SiFive FU740 PCIe driver.

Link: https://lore.kernel.org/r/20210504105940.100004-4-greentime.hu@sifive.comSigned-off-by: Greentime Hu <greentime.hu@sifive.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>