omap2 clock: use symbolic constants in clock.h rate_offset/src_offset fields

Convert most of the magic numbers remaining in mach-omap2/clock.h to
symbolic constants.  This primarily affects the src_offset/rate_offset
fields.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/cm_regbits_24xx.h

@@ -323,8 +323,11 @@
 #define OMAP24XX_DPLL_MULT_MASK				(0x3ff << 12)
 #define OMAP24XX_DPLL_DIV_SHIFT				8
 #define OMAP24XX_DPLL_DIV_MASK				(0xf << 8)
+#define OMAP24XX_54M_SOURCE_SHIFT			5
 #define OMAP24XX_54M_SOURCE				(1 << 5)
+#define OMAP2430_96M_SOURCE_SHIFT			4
 #define OMAP2430_96M_SOURCE				(1 << 4)
+#define OMAP24XX_48M_SOURCE_SHIFT			3
 #define OMAP24XX_48M_SOURCE				(1 << 3)
 #define OMAP2430_ALTCLK_SOURCE_SHIFT			0
 #define OMAP2430_ALTCLK_SOURCE_MASK			(0x7 << 0)