spi: introduce new helpers with using modern naming

For using modern names host/target to instead of all the legacy names,
I think it takes 3 steps:
  - step1: introduce new helpers with modern naming.
  - step2: switch to use these new helpers in all drivers.
  - step3: remove all legacy helpers and update all legacy names.

This patch is for step1, it introduces new helpers with host/target
naming for drivers using.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20221011092204.950288-1-yangyingliang@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>