parisc: disable -mlong-calls compiler option for kernel modules

parisc: disable -mlong-calls compiler option for kernel modules

CONFIG_MLONGCALLS was introduced in commit
9725c8a10b7bf408e5a566a894fdd9e690c411bb to overcome linker issues when linking
huge linux kernels, e.g. with many modules linked in.

But in the kernel module loader there is no support yet for the new relocation
types, which is why modules built with -mlong-calls can't be loaded.
Furthermore, for modules long calls are not really necessary, since we already
use stub sections which resolve long distance calls.

So, let's just disable this compiler option when compiling kernel modules.

Signed-off-by: Helge Deller <deller@gmx.de>