arm: traps: handle SMC32 in check_conditional_instr()

arm: traps: handle SMC32 in check_conditional_instr()

On ARMv8 architecture we need to ensure that conditional check was passed
for a trapped SMC instruction that originates from AArch32 state
(ARM DDI 0487B.a page D7-2271).
Thus, we should not skip it while checking HSR.EC value.

For this type of exception special coding of HSR.ISS is used. There is
additional flag (CCKNOWNPASS) to be checked before performing standard
handling of CCVALID and COND fields.

Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Reviewed-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>