msm: sdm855: Replace sdm855 with sm8150

Update the code name from sdm855 to sm8150.
Rename all files that contain "sdm855" in their names,
and update all file content that contains "sdm855".

Change-Id: I109192e9dbd9e0df65af86aa3cd3c390df104cc8
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>