Relax TM.isMultiSimSupported with READ_BASIC_PHONE_STATE permission

This change relaxes permission for the API
TelephonyManager.isMultiSimSupport, allowing apps with
READ_BASIC_PHONE_STATE to check if the device support multiple SIMs.

Whether a device support multiple SIMs is a basic public information
that doesn't always need READ_PHONE_STATE or carrier privileges. The
relaxed permission makes the API more useful without leaking any
sensitive info.

Bug: 401006757
Test: atest CtsTelephony2TestCases CtsTelephonyTestCases
Flag: com.android.internal.telephony.flags.macro_based_opportunistic_networks
Change-Id: Ia79260db109769c491dc6022597bc6b64b5fb969