omap2+: Rename timer-gp.c into timer.c to combine timer init functions

We can keep everything sys_timer and gptimer.c related code in
timer.c as the code will be very minimal.

Later on we can also remove timer-mpu.c, as it can be called from
omap4_timer_init function.

This allows us to get rid of confusing existing files. We currently
have timer-gp.c, timer-mpu.c, and patches have been posted to add
dmtimer.c. There's no need to have these multiple files, we can
put everything into timer.c.

Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/Makefile

@@ -3,7 +3,7 @@
 #
 
 # Common support
-obj-y := id.o io.o control.o mux.o devices.o serial.o gpmc.o timer-gp.o pm.o \
+obj-y := id.o io.o control.o mux.o devices.o serial.o gpmc.o timer.o pm.o \
 	 common.o gpio.o dma.o wd_timer.o
 
 omap-2-3-common				= irq.o sdrc.o

arch/arm/mach-omap2/timer.c

@@ -1,5 +1,5 @@
 /*
- * linux/arch/arm/mach-omap2/timer-gp.c
+ * linux/arch/arm/mach-omap2/timer.c
  *
  * OMAP2 GP timer support.
  *
@@ -230,7 +230,7 @@ static void __init omap2_gp_clockevent_init(int gptimer_id,
 /* Clocksource code */
 
 #ifdef CONFIG_OMAP_32K_TIMER
-/* 
+/*
  * When 32k-timer is enabled, don't use GPTimer for clocksource
  * instead, just leave default clocksource which uses the 32k
  * sync counter.  See clocksource setup in plat-omap/counter_32k.c