MAINTAINERS: update FPU EMULATOR web page

The web page entry for the FPU EMULATOR no longer works.  I notified Bill
of this and he asked me to update it to this new entry.

Link: https://lkml.kernel.org/r/20230214170208.17287-1-rdunlap@infradead.org


Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Bill Metzenthen <billm@melbpc.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>