msm: socinfo: Rename msmtellurium to msm8952

msm8952 is the official name for msmtellurium,
so rename msmtellurium with msm8952.

1) Add msm8952 board variants to the documentation
   and replace instances of msmtellurium with msm8952.
2) Update socinfo driver to reflect msm8952 chip ID
   and rename msmtellurium with msm8952.
3) Update diag driver to reflect msm8952.

Change-Id: I9f579d55b8bf7e340420aaf57f7e0537691fc170
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>