target/arm: Add is_secure parameter to v7m_read_half_insn

target/arm: Add is_secure parameter to v7m_read_half_insn

Remove the use of regime_is_secure from v7m_read_half_insn, using
the new parameter instead.

As it happens, both callers pass true, propagated from the argument
to arm_v7m_mmu_idx_for_secstate which created the mmu_idx argument,
but that is a detail of v7m_handle_execute_nsc we need not expose
to the callee.

Reviewed-by: Peter Maydell <[email protected]>
Reviewed-by: Alex Bennée <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>
Message-id: 20221001162318[email protected]
Signed-off-by: Peter Maydell <[email protected]>