remoteproc: qcom_q6v5_mss: Add support for MSM8998

MSM8998 sits between MSM8996 and SDM845 in terms of functionality needed to
boot the modem subsystem.  Booting mss allows for servicing the traditional
cellular usecases along with the wireless usecases such as wifi.

Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>