target/arm: Create new arm_v7m_mmu_idx_for_secstate_and_priv()

target/arm: Create new arm_v7m_mmu_idx_for_secstate_and_priv()

The TT instruction is going to need to look up the MMU index
for a specified security and privilege state. Refactor the
existing arm_v7m_mmu_idx_for_secstate() into a version that
lets you specify the privilege state and one that uses the
current state of the CPU.

Signed-off-by: Peter Maydell <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
Message-id: 1512153879[email protected]
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>