Test: Remove IAK public key Secure Partition

With new OTP implementation, it is unnecessary to maintain a dedicated
secure partition to export IAK public key to non-secure tests.
Remove the related service code, configuration and yaml entry.

Signed-off-by: David Hu <david.hu@arm.com>
Change-Id: I7901bc3539e2dac1cb371d286d90d33b1bd4c869
13 files changed