Check whether eUICC is supported using bit mask

The spec ETSI TS 102 221 defines that if b8 and b2 of the tB are set to
1, eUICC is supported. The value of other bits are not necessarily 0.
So we should check tB using bit mask instead of value.

Bug: 119780944
Test: test on phone
Change-Id: I8e3b9ab979d278d2d29f2f69695b31c1d55db65d