msm: smem: call smd_fake_irq_handler directly in msm_smd_probe
tasklet_schedule can't guarantee the function will be called immediately.
If the smd_fake_irq_handler(0) is not called on time, the rpm_request channel may not be allocated on time, thus lead to rpm_smd probe panic.
src: https://github.com/MotorolaMobilityLLC/kernel-msm/commit/8c75970ff739bcf9ac79cfb9a42e14f6e2b2ebfd