smem: msm: Fix memory-region lookup, direct <reg> mapping and update SMEM host count

The SMEM driver was failing to resolve memory regions on some boards
because `dev_of_offset()` + `fdtdec_lookup_phandle()` did not yield a
valid DT node. Modernize the code to use driver-model/ofnode accessors
and make the probe robust for both DT styles (direct `reg` vs
`memory-region` phandle).

- qcom_smem_map_memory():
  * Drop fdtdec path; use dev_read_phandle_with_args() +
    ofnode_read_resource().
  * Use dev_read_phandle_with_args() +
    fnode_read_resource().

- qcom_smem_probe():
  * Try dev_read_addr_size() first (map via <reg>), else fall back to
    qcom_smem_map_memory() with "memory-region".
  * Check "qcom,rpm-msg-ram" presence to add second region.

- Additionally, SMEM_HOST_COUNT is increased to support newer SMEM
  versions that include more remote processors. This avoids failures
  during processor ID checks.

Signed-off-by: Aswin Murugan <[email protected]>
Reviewed-by: Varadarajan Narayanan <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Casey Connolly <[email protected]>

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