tee: fix tee_ioctl_object_invoke_arg padding

tee: fix tee_ioctl_object_invoke_arg padding

The tee_ioctl_object_invoke_arg structure has padding on some
architectures but not on x86-32 and a few others:

include/linux/tee.h:474:32: error: padding struct to align 'params' [-Werror=padded]

I expect that all current users of this are on architectures that do
have implicit padding here (arm64, arm, x86, riscv), so make the padding
explicit in order to avoid surprises if this later gets used elsewhere.

Fixes: d5b8b0fa1775 ("tee: add TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Tested-by: Harshal Dev <harshal.dev@oss.qualcomm.com>
Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>