CRISv32: add unreachable() to BUG()
CRISv32: add unreachable() to BUG()

Add an unreachable() in the BUG() implementations, to get rid of
several warnings similar to the one below:

 kernel/sched/core.c: In function 'pick_next_task':
 kernel/sched/core.c:2690:1: warning: control reaches end of non-void function [-Wreturn-type]

Signed-off-by: Rabin Vincent <6bd3f43fd5b2b5689bccc97f6d09e3eb28307598@rab.in>
Signed-off-by: Jesper Nilsson <e2461025c07dd5a88c415fdf21ed4fdd31c0489d@axis.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs