firmware: qcom: scm: smc: switch to using the SCM allocator

We need to allocate, map and pass a buffer to the trustzone if we have
more than 4 arguments for a given SCM call. Let's use the new TrustZone
allocator for that memory and shrink the code in process.

As this code lives in a different compilation unit than the rest of the
SCM code, we need to provide a helper in the form of
qcom_scm_get_tzmem_pool() that allows the SMC low-level routines to
access the SCM memory pool.

Signed-off-by: Bartosz Golaszewski <[email protected]>
Reviewed-by: Andrew Halaney <[email protected]>
Tested-by: Andrew Halaney <[email protected]> # sc8280xp-lenovo-thinkpad-x13s
Tested-by: Deepti Jaggi <[email protected]> #sa8775p-ride
Reviewed-by: Elliot Berman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

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