powerpc: Move include files to arch/powerpc/include/asm

from include/asm-powerpc.  This is the result of a

mkdir arch/powerpc/include/asm
git mv include/asm-powerpc/* arch/powerpc/include/asm

Followed by a few documentation/comment fixups and a couple of places
where <asm-powepc/...> was being used explicitly.  Of the latter only
one was outside the arch code and it is a driver only built for powerpc.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/include/asm/backlight.h

@@ -0,0 +1,41 @@
+/*
+ * Routines for handling backlight control on PowerBooks
+ *
+ * For now, implementation resides in
+ * arch/powerpc/platforms/powermac/backlight.c
+ *
+ */
+#ifndef __ASM_POWERPC_BACKLIGHT_H
+#define __ASM_POWERPC_BACKLIGHT_H
+#ifdef __KERNEL__
+
+#include <linux/fb.h>
+#include <linux/mutex.h>
+
+/* For locking instructions, see the implementation file */
+extern struct backlight_device *pmac_backlight;
+extern struct mutex pmac_backlight_mutex;
+
+extern int pmac_backlight_curve_lookup(struct fb_info *info, int value);
+
+extern int pmac_has_backlight_type(const char *type);
+
+extern void pmac_backlight_key(int direction);
+static inline void pmac_backlight_key_up(void)
+{
+	pmac_backlight_key(0);
+}
+static inline void pmac_backlight_key_down(void)
+{
+	pmac_backlight_key(1);
+}
+
+extern void pmac_backlight_set_legacy_brightness_pmu(int brightness);
+extern int pmac_backlight_set_legacy_brightness(int brightness);
+extern int pmac_backlight_get_legacy_brightness(void);
+
+extern void pmac_backlight_enable(void);
+extern void pmac_backlight_disable(void);
+
+#endif /* __KERNEL__ */
+#endif