soc: fsl: qe: fix typo in a comment

The double `is' in the comment in line 150 is repeated. Remove one
of them from the comment.  Also removes a redundant tab in a new line.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>