arm:create SoC specific bsp directory and move code to there.

Created a new directory called bsp (board support package) to hold
board or system on chip specific code. The idea is the following.

Change-Id: Ica5886806940facae2fa5492fcc938b3c2b989be

lib/libsys/arch/earm/frclock_util.c

@@ -3,7 +3,6 @@
  * similar to the read_tsc functions. On hardware we could actually make use
  * of the timer overflow counter, but emulator doesn't emulate it. */
 
-#include "omap_timer_registers.h"
 #include <minix/minlib.h>
 #include <minix/sysutil.h>
 #include <minix/type.h>