IB/ehca: Fix eHCA driver compilation for uniprocessor

The eHCA driver does not compile for a uniprocessor configuration
(CONFIG_SMP=n), due to H_SUCCESS and other symbols being undefined.
This fixes it.

Signed-off-by: Paul Mackerras <[e-mail]>
Acked-by: Hoang-Nam Nguyen <[e-mail]>
Signed-off-by: Roland Dreier <[e-mail]>

drivers/infiniband/hw/ehca/ehca_tools.h

···
 #include <asm/ibmebus.h>
 #include <asm/io.h>
 #include <asm/pgtable.h>
+#include <asm/hvcall.h>
 
 extern int ehca_debug_level;