power: qcom: apm: replace msmtitanium code name with MSM8953

Remove all reference to the internal code name "msmtitanium" and
replace them with "MSM8953" which is the official name for the
SoC.

Change-Id: I1637b0270ddbe8283dd9b4ba07e8e263b0a5a944
Signed-off-by: David Collins <collinsd@codeaurora.org>