docs(maintainers): update qti maintainer
docs(maintainers): update qti maintainer

Add lachit and Sreevyshanavi in qti maintainer

Signed-off-by: Saurabh Gorecha <5cd361798229f00a94e00004ff7e7926d09bd5c1@codeaurora.org>
Change-Id: I48d2378551775a3ad63bc7c3a4e2b62b15c4770d

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware