VTS: Fix IRadio.setAllowedCarriers and IRadio.nvResetConfig

1) IRadio.setAllowedCarriers
Fix IRadio.setAllowedCarriers to pass no restrictions.
Passing restrictions will block all other SIM cards until
a new IRadio.setAllowedCarriers with no restriction is
invoked. Even factory reset will not recover.

2) IRadio.nvResetConfig
IRadio.nvResetConfig with ResetNvType RELOAD causes radio restart.
All subsuquent scripts fail with cause RADIO_NOT_AVAILABLE.
Fix to use ResetNvType ERASE which does not restart the radio.

Test: VTS
Bug: 37946160

Change-Id: Ib671758414cc97e1a596358306f89eed13918c48