s390/vx: add vx-insn.h wrapper include file

The vector instruction macros can also be used in inline assemblies. For
this the magic

asm(".include \"asm/vx-insn.h\"\n");

must be added to C files in order to avoid that the pre-processor
eliminates the __ASSEMBLY__ guarded macros. This however comes with the
problem that changes to asm/vx-insn.h do not cause a recompile of C files
which have only this magic statement instead of a proper include statement.
This can be observed with the arch/s390/kernel/fpu.c file.

In order to fix this problem and also to avoid that the include must
be specified twice, add a wrapper include header file which will do
all necessary steps.

This way only the vx-insn.h header file needs to be included and changes to
the new vx-insn-asm.h header file cause a recompile of all dependent files
like it should.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

arch/s390/kernel/fpu.c

@@ -10,8 +10,7 @@
 #include <linux/sched.h>
 #include <asm/fpu/types.h>
 #include <asm/fpu/api.h>
-
-asm(".include \"asm/vx-insn.h\"\n");
+#include <asm/vx-insn.h>
 
 void __kernel_fpu_begin(struct kernel_fpu *state, u32 flags)
 {

lib/raid6/s390vx.uc

@@ -13,8 +13,7 @@
 
 #include <linux/raid/pq.h>
 #include <asm/fpu/api.h>
-
-asm(".include \"asm/vx-insn.h\"\n");
+#include <asm/vx-insn.h>
 
 #define NSIZE 16