Fix the typo "warn" -> "warm".

Also fix the following checkpatch.pl warnings:

  CHECK: Prefer using the BIT macro
  CHECK: No space is necessary after a cast
  CHECK: Alignment should match open parenthesis
  CHECK: Unnecessary parentheses around uniphier_io_policies[image_id].dev_handle

Change-Id: Ic11eea2668c4bf2d1e8f089e6338ba7b7156d80b
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>