Revert "ifx_n721: Explicitly fail if attempting to open a tty before it's ready"

This reverts commit b162f578dce965a467bc01c12bd8318eb051a937.
Revert "Revert some changes, enable modem control"

This reverts commit 4bc27cefbd22ff2484b95a66e66f81e3818885ff.
Revert "bproj: Updates from LGE's v30b P970 drop"

This reverts commit bc7639365c2afa732b1497b9acff4064824040a9.
Bump version to 1.7

Change-Id: Ic939411f7afa3344ebd44fdb07ddfe090810be6f