ARM: DaVinci - Add missing define for PLLDIV7

The davinci clock.h file contains PLLDIVx defines for all but PLLDIV7
so add it.
Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

arch/arm/mach-davinci/clock.h

@@ -42,6 +42,7 @@
 #define PLLDIV4         0x160
 #define PLLDIV5         0x164
 #define PLLDIV6         0x168
+#define PLLDIV7         0x16c
 #define PLLDIV8         0x170
 #define PLLDIV9         0x174
 #define PLLDIV_EN       BIT(15)