Fixing RSA tests not using the correct exponent

The Keymaster 4.0 HAL specifies that the public exponent for RSA is F4
(2^16+1). There were a few tests still using 3 as the exponent. This
patch updates those incorrect exponents accordingly.

Bug: 143404829
Test: atest VtsHalKeymasterV4_0TargetTest
Change-Id: Ibc82a8a912bc5926bcdd544e0370e4185a888c0d