arm:replace ifdef's by runtime checks in the omap rtc driver.

Change-Id: I038f0fcf88061ae60d6d029d86c84153bf0f0020

drivers/readclock/arch/earm/omap_rtc.c

@@ -4,6 +4,7 @@
 #include <minix/mmio.h>
 #include <minix/clkconf.h>
 #include <minix/sysutil.h>
+#include <minix/board.h>
 
 #include <sys/mman.h>
 #include <sys/types.h>
@@ -197,7 +198,10 @@ omap_rtc_init(void)
 	int rtc_rev, major, minor;
 	struct minix_mem_range mr;
 
-#ifndef AM335X
+	struct machine  machine ;
+	sys_getmachine(&machine);
+
+	if(! BOARD_IS_BB(machine.board_id)){
 		/* Only the am335x (BeagleBone & BeagleBone Black) is supported ATM.
 		 * The dm37xx (BeagleBoard-xM) doesn't have a real time clock
 		 * built-in. Instead, it uses the RTC on the PMIC. A driver for
@@ -205,7 +209,7 @@ omap_rtc_init(void)
 		 */
 		log_warn(&log, "unsupported processor\n");
 		return ENOSYS;
-#endif /* !AM335X */
+	}
 
 	if (pwr_off_in_progress)
 		return EINVAL;