f75303: Make get_temp return temperature in Kelvin
f75303: Make get_temp return temperature in Kelvin

This patch makes get_temp of f75303 driver return the temperature
in Kelvin. This makes code more readable and efficient. There should
be no functionality change.

Signed-off-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>

BUG=none
BRANCH=none
TEST=Verify temps command print expected temperature on Sona.

Change-Id: Id5c052b8b97822348ec1c1c6a2c62529ecac9463
Reviewed-on: https://chromium-review.googlesource.com/1142692
Commit-Ready: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Tested-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Reviewed-by: Aaron Durbin <af0622ab041e8b0f8e5819838dcc93898196e71f@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec