Revert "qcom-common: Update postboot for 8974"

this didn't get merged in CM

This reverts commit 2479aa043992806e420bd18f3839d50baf98ee29.
Revert "increase msm8974 post_boot dynamicism"

I don't recall what device needed this, but its kernel must have been a crapsack. This is no longer needed.

This reverts commit a94551c91d84324ec9d972f7a4cba55e8bcf2422.