In some board cpld.h files the definition of the cpld_data struct
not-quite makes a typedef for cpld_data_t.  This problem is caught with
gcc-11 as a multiple definition error.  As there are no users of this
non-typedef, fix this by not declaring it one to begin with.

Cc: Priyanka Jain <priyanka.jain@nxp.com>
Cc: Shengzhou Liu <Shengzhou.Liu@nxp.com>
Signed-off-by: Tom Rini <trini@konsulko.com>