Enable &wcnss_mem for msm8939-longcheer-l9100. This is needed now to
have WCNSS working. It was missed when &wcnss_mem was disabled by
default because the patch with the msm8939-longcheer-l9100 device tree
was not applied yet.

Fixes: 0ece6438 ("arm64: dts: qcom: msm8916/39: Disable unneeded firmware reservations")
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: André Apitzsch <git@apitzsch.eu>
Tested-by: André Apitzsch <git@apitzsch.eu>
Link: https://lore.kernel.org/r/20230921-msm8916-rmem-fixups-v1-2-34d2b6e721cf@gerhold.netSigned-off-by: Bjorn Andersson <andersson@kernel.org>