firmware: qcom_scm-64: Move SMC register filling to qcom_scm_call_smccc

firmware: qcom_scm-64: Move SMC register filling to qcom_scm_call_smccc

qcom_scm_call_smccc should be responsible for converting qcom_scm_desc
into arguments for smc call. Consolidate the dispersed logic to convert
qcom_scm_desc into smc arguments inside qcom_scm_call_smccc.

Tested-by: Brian Masney <masneyb@onstation.org> # arm32
Tested-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Elliot Berman <eberman@codeaurora.org>
Link: https://lore.kernel.org/r/1578431066-19600-8-git-send-email-eberman@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>