Bugs fix for eUICC.

1) Bug fix on getProfile. Should have an A0 tag when creating the
request for getProfile and pad the trailing Fs back.
2) Check null on payload to avoid NPE.
3) Fix a typo on device capabilities. cdma1x should not have the
underscore.
4) Fix the bug on length cut when creating an APDU command segment.

Bug: 77661092
Test: test on phone, unit test
Change-Id: I69ac74179d96a51fdbff9eba34e17c379e5a1bdd