spi: rockchip: Fix code indent should use tabs where possible

Fix checkpatch errors:

  ERROR: code indent should use tabs where possible
  #484: FILE: spi-rockchip.c:484:
  +^I        | CR0_BHT_8BIT << CR0_BHT_OFFSET$
  ERROR: code indent should use tabs where possible
  #485: FILE: spi-rockchip.c:485:
  +^I        | CR0_SSD_ONE  << CR0_SSD_OFFSET$
  ERROR: code indent should use tabs where possible
  #486: FILE: spi-rockchip.c:486:
  +^I        | CR0_EM_BIG   << CR0_EM_OFFSET;$
Signed-off-by: Jay Fang <f.fangjian@huawei.com>
Link: https://lore.kernel.org/r/1616566602-13894-11-git-send-email-f.fangjian@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>