arm: processor: add new struct hsr_smc32 into hsr union

arm: processor: add new struct hsr_smc32 into hsr union

On ARMv8, one of conditional exceptions (SMC that originates
from AArch32 state) has extra field in HSR.ISS encoding:

CCKNOWNPASS, bit [19]
Indicates whether the instruction might have failed its condition
code check.
   0 - The instruction was unconditional, or was conditional and
   passed  its condition code check.
   1 - The instruction was conditional, and might have failed its
   condition code check.
(ARM DDI 0487B.a page D7-2272)

This is an instruction specific field, so better to add new structure
to union hsr. This structure describes ISS encoding for an exception
from SMC instruction executing in AArch32 state. But we define this
struct for both ARMv7 and ARMv8, because ARMv8 encoding is backwards
compatible with ARMv7.

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