staging: rtl8188eu: Use "ODM_REG_CCK_CCA_11N" in ODM_Write_CCK_CCA_Thres()

Use "ODM_REG_CCK_CCA_11N" directly instead of using ODM_REG(CCK_CCA, pDM_Odm)
which produces same after preprocessing.

Signed-off-by: navin patidar <navin.patidar@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>