hal: msim_voice_extn: Set msim_phone based on phone_type parameter

* This is consistently cp1 on SIM1 and cp2 on SIM2, so drop all the
  confusing and unnecessary property_get calls, and just use the param

Change-Id: I4a59ebd177d46b47e00067af7e6dce49d3e7e676
Signed-off-by: Gegham Zakaryan <zakaryan.2004@outlook.com>