ARM: davinci: create new common platform header for davinci

Remove individual platform header files for dm365, dm355, dm644x
and dm646x and consolidate it into a single and common
header file davinci.h placed in arch/arm/mach-davinci.

This reduces the pollution in the include/mach and is consistent
with Russell's suggestions as part of his "pet peaves" mail.
(See #4 in: http://lists.infradead.org/pipermail/linux-arm-kernel/2011-November/071516.html)

While at it, fix the forward declaration of spi_board_info,
and include the right header file instead.

The further patches in the series take  advantage of this consolidation
for easy implementation of IO_ADDRESS elimination.

Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com>
[nsekhar@ti.com: make davinci.h the first local include file,
fix forward declaration of spi_board_info and add back Deep Root
Systems, LLC copyright]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
diff --git a/arch/arm/mach-davinci/dm365.c b/arch/arm/mach-davinci/dm365.c
index 5b40a20..d831d94 100644
--- a/arch/arm/mach-davinci/dm365.c
+++ b/arch/arm/mach-davinci/dm365.c
@@ -21,7 +21,6 @@
 
 #include <asm/mach/map.h>
 
-#include <mach/dm365.h>
 #include <mach/cputype.h>
 #include <mach/edma.h>
 #include <mach/psc.h>
@@ -35,6 +34,7 @@
 #include <mach/spi.h>
 #include <mach/gpio-davinci.h>
 
+#include "davinci.h"
 #include "clock.h"
 #include "mux.h"