ANDROID: trusty: make TRUSTY_IRQ and TRUSTY_LOG deselectable

Currently TRUSTY_IRQ and TRUSTY_LOG are forced on whenever TRUSTY is,
which defeats the point of them being separate options.

Make them deselectable so that the user can disable these modules if
they aren't needed.

Change-Id: I6e5199bea203918dcb967f257e2797b105b03ca4
Signed-off-by: Eric Biggers <ebiggers@google.com>