ANDROID: hikey960_gki.fragment: Remove NVME_TARGET

Apparently years ago to support NVME on HiKey960's M.2 socket,
we enabled more NVME options then needed.

NVME_TARGET is for NVME devices, not hosts, so remove it.

Bug: 181865549
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: If3eaa2a87bcf14ac4108bbd155483e3caacd5920