arm: Adds board_postclk_init to the init_sequence.

The board_postclk_init() function can be used to perform operations
that requires a working timer early within the U-Boot init_sequence.

Signed-off-by: Markus Hubig <mhubig@imko.de>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

arch/arm/lib/board.c

@@ -241,6 +241,9 @@ init_fnc_t *init_sequence[] = {
 	fdtdec_check_fdt,
 #endif
 	timer_init,		/* initialize timer */
+#ifdef CONFIG_BOARD_POSTCLK_INIT
+	board_postclk_init,
+#endif
 #ifdef CONFIG_FSL_ESDHC
 	get_clocks,
 #endif