Cconfig: Add sparc-leon processors, remove deprecated v9 Sparc type.

Add the Sparc processor variants hfleon (fpu,v9), hfleonv8 (fpu,v8),
sfleon (softfpu,v7) sfleonv8 (softfpu,v8) and tweak the existing ones.

Signed-off-by: Konrad Eisele <konrad@gaisler.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>