[Bug target/96125] __attribute__((target("cpu=power10,mma"))) does not set TARGET_MMA

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96125

--- Comment #2 from Peter Bergner <bergner at gcc dot gnu.org> ---
Looks like some missing code in rs6000_option_override_internal() to enable
TARGET_MMA by default when -mcpu=power10 is used, similar to how we handle
-mprefix.  I'm testing a patch.