powerpc: move ASM_CONST and stringify_in_c() into asm-const.h

This patch moves ASM_CONST() and stringify_in_c() into
dedicated asm-const.h, then cleans all related inclusions.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: asm-compat.h should include asm-const.h]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kvm/book3s_64_slb.S

@@ -17,6 +17,8 @@
  * Authors: Alexander Graf <agraf@suse.de>
  */
 
+#include <asm/asm-compat.h>
+
 #define SHADOW_SLB_ENTRY_LEN	0x10
 #define OFFSET_ESID(x)		(SHADOW_SLB_ENTRY_LEN * x)
 #define OFFSET_VSID(x)		((SHADOW_SLB_ENTRY_LEN * x) + 8)

arch/powerpc/kvm/book3s_hv_interrupts.S

@@ -27,6 +27,7 @@
 #include <asm/asm-offsets.h>
 #include <asm/exception-64s.h>
 #include <asm/ppc-opcode.h>
+#include <asm/asm-compat.h>
 
 /*****************************************************************************
  *                                                                           *

arch/powerpc/kvm/book3s_hv_rmhandlers.S

@@ -32,6 +32,7 @@
 #include <asm/opal.h>
 #include <asm/xive-regs.h>
 #include <asm/thread_info.h>
+#include <asm/asm-compat.h>
 
 /* Sign-extend HDEC if not on POWER9 */
 #define EXTEND_HDEC(reg)			\

arch/powerpc/kvm/book3s_interrupts.S

@@ -23,6 +23,7 @@
 #include <asm/page.h>
 #include <asm/asm-offsets.h>
 #include <asm/exception-64s.h>
+#include <asm/asm-compat.h>
 
 #if defined(CONFIG_PPC_BOOK3S_64)
 #ifdef PPC64_ELF_ABI_v2

arch/powerpc/kvm/book3s_rmhandlers.S

@@ -23,6 +23,7 @@
 #include <asm/mmu.h>
 #include <asm/page.h>
 #include <asm/asm-offsets.h>
+#include <asm/asm-compat.h>
 
 #ifdef CONFIG_PPC_BOOK3S_64
 #include <asm/exception-64s.h>

arch/powerpc/kvm/book3s_segment.S

@@ -19,6 +19,8 @@
 
 /* Real mode helpers */
 
+#include <asm/asm-compat.h>
+
 #if defined(CONFIG_PPC_BOOK3S_64)
 
 #define GET_SHADOW_VCPU(reg)    \