soc: qcom: Migrate SCM calls in jtagv8

Adding API to upstream driver to get JTAG ETM feat id.
Migrating SCM calls used in the JTAG driver.

Change-Id: I60cd57d5c6aae62ec089e960b55ac221f0474f64
Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org>
Signed-off-by: Elliot Berman <eberman@codeaurora.org>