sb800: sata combine mode configure fix

sb800: sata combine mode configure fix

Using micro CIMX_OPTION_ENABLED/CIMX_OPTION_DISABLED to
configure SataIdeCombinedMode is wrong.

sbPowerOnInit() use SataIdeCombinedMode to determine whether hide the IDE controller
  0: IDE controller is exposed and Combined Mode is enabled.
     SATA controller has control over Port0 through Port3,
     IDE controller has control over Port4 and Port5
  1: IDE controller is hidden and Combined Mode is disabled,
     SATA controller has full control of all 6 Ports when operating in non-IDE mode

Change-Id: I32e7101737f1dbfff49daa58670e6820b476b250
Signed-off-by: Kerry Sheh <kerry.she@amd.com>
Signed-off-by: Kerry Sheh <shekairui@gmail.com>
Reviewed-on: http://review.coreboot.org/229
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marcj303@gmail.com>