configs/qemu: cleanup and capitalization

Capitalize comments in a consistent way.
Cleanup redundant entries.
Drop global patch dir for sparc ss10 since it's not required any more.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>