serial: qcom: add support for GENI serial driver

Generic Interface (GENI) Serial Engine (SE) based uart
can be found on newer qualcomm SOCs, starting from SDM845.
Tested on Samsung SM-G9600(starqltechn)
by chain-loading u-boot with stock bootloader.

Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
Cc: Ramon Fried <rfried.dev@gmail.com>
Cc: Tom Rini <trini@konsulko.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 4ed72ae..1b3f6c5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -400,6 +400,7 @@
 F:	drivers/mmc/msm_sdhci.c
 F:	drivers/phy/msm8916-usbh-phy.c
 F:	drivers/serial/serial_msm.c
+F:	drivers/serial/serial_msm_geni.c
 F:	drivers/smem/msm_smem.c
 F:	drivers/usb/host/ehci-msm.c