msm: ipa: optimize state machine in ipa uc offload

Optimize state machine of ipa_uc_offload.c to avoid the
race condition where client driver is not allowed to
de-register interface properties after registering
properties.

Change-Id: I5569d29c97fd11cbf81b4388589841d162977f6b
Acked-by: Shihuan Liu <shihuanl@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>