rk3288: Remove duplicate timestamp_init()

Fix bug introduced by merging http://review.coreboot.org/9606 and
http://review.coreboot.org/10740 in the wrong order.

Change-Id: I75dd22cd0cf30c7d91e4fa5171cb482a80eb64ca
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/15070
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/rockchip/rk3288/bootblock.c

@@ -26,8 +26,6 @@
 
 void bootblock_soc_init(void)
 {
-	timestamp_init(timestamp_get());
-
 	rkclk_init();
 
 	mmu_init();