Revert "Do not power down SIM card when modem is sent to Low Power Mode."

This reverts commit 42ac608a497fbecb9e8fd6a2b23f479a290498cc.
Revert "Update init.dlx.usb.rc to work with CAF usb stack"

This reverts commit f4a026b103b41f3fdec67bf1893800fbe1342927.