[ioapi] Move PAGE_SHIFT to bits/io.h

The PAGE_SHIFT definition is an architectural property, rather than an
aspect of a particular I/O API implementation (of which, in theory,
there may be more than one per architecture).

Reflect this by moving the definition to the top-level bits/io.h for
each architecture.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/arm/include/bits/io.h

diff --git a/src/arch/arm/include/bits/io.h b/src/arch/arm/include/bits/io.h
index 90f6455..272ec12 100644
--- a/src/arch/arm/include/bits/io.h
+++ b/src/arch/arm/include/bits/io.h
@@ -9,6 +9,9 @@
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
+/** Page shift */
+#define PAGE_SHIFT 12
+
 #include <ipxe/arm_io.h>
 
 #endif /* _BITS_IO_H */

src/arch/arm/include/ipxe/arm_io.h

diff --git a/src/arch/arm/include/ipxe/arm_io.h b/src/arch/arm/include/ipxe/arm_io.h
index 105f22b..046cbdb 100644
--- a/src/arch/arm/include/ipxe/arm_io.h
+++ b/src/arch/arm/include/ipxe/arm_io.h
@@ -20,9 +20,6 @@
  *
  */
 
-/** Page shift */
-#define PAGE_SHIFT 12
-
 /*
  * Physical<->Bus address mappings
  *

src/arch/x86/include/bits/io.h

diff --git a/src/arch/x86/include/bits/io.h b/src/arch/x86/include/bits/io.h
index 60c2e3e..95673ad 100644
--- a/src/arch/x86/include/bits/io.h
+++ b/src/arch/x86/include/bits/io.h
@@ -9,6 +9,9 @@
 
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
+/** Page shift */
+#define PAGE_SHIFT 12
+
 #include <ipxe/x86_io.h>
 
 #endif /* _BITS_IO_H */

src/arch/x86/include/ipxe/x86_io.h

diff --git a/src/arch/x86/include/ipxe/x86_io.h b/src/arch/x86/include/ipxe/x86_io.h
index a6ebe1f..eeb3f84 100644
--- a/src/arch/x86/include/ipxe/x86_io.h
+++ b/src/arch/x86/include/ipxe/x86_io.h
@@ -28,9 +28,6 @@
  *
  */
 
-/** Page shift */
-#define PAGE_SHIFT 12
-
 /*
  * Physical<->Bus address mappings
  *