Revert "RIL: update SIM_IO struct"

SEEK is merged in RIL. No need for this.
This reverts commit ec0f11b9c7deed1445eca5368e0ee6f6cd3edcdb.
Revert "blue-common: use custom RIL header"

SEEK is supported. No need for this.
This reverts commit 500f9e3f6515fef2aa32b6b5a99bfd198d9f9d08.