msm: pm: Revert PM patches

Revert "msm: pm: Clean up idle-v7"
This reverts commit e206db0f2c66fc4b2df58afb80a1fe3690860be6.

Revert "msm: pm: Rename pm-8x60.c to msm-pm.c"
This reverts commit 21d5af2b4e69e24ab2278ca9131a8e86612e5324.

Revert "msm: idle: Use ARM suspend/resume APIs to restore during warmboot"
This reverts commit 1ea0122dac9c92edc64a5a33e2a4fa8396253a1a.