staging: r8188eu: odm SupportPlatform is always ODM_CE

Remove the SupportPlatform entry of struct odm_dm_struct and any code
that depends on SupportPlatform != ODM_CE.

Merge functions in places where there was a "top-level function" that
would select a "sub-function" based on SupportPlatform.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211011201159.10252-9-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>