ARM: OMAP: Don't store timers physical address

The OMAP2+ system timer code stores the physical address of the timer
but never uses it. Remove this and clean-up the code by removing the
local variable "size" and changing the names of the local variables
mem_rsrc and irq_rsrc to mem and irq, respectively.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>

arch/arm/plat-omap/include/plat/dmtimer.h

@@ -261,7 +261,6 @@ int omap_dm_timers_active(void);
 		(_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT))
 
 struct omap_dm_timer {
-	unsigned long phys_base;
 	int id;
 	int irq;
 	struct clk *fclk;