rockchip: arm64: rk3399: remove unconditional debug message

An earlier upstream change contained an unconditional debug message
which would show up as a message similar to the following in the
U-Boot startup (after the ATF and before the U-Boot banner):
      time 159f019, 0

This commit removes this message (instead of making if conditional on
being a debug-build), as it doesn't pertain to any initialisation done
in this file.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Simon Glass <sjg@chromium.org>

arch/arm/mach-rockchip/rk3399/rk3399.c

@@ -40,6 +40,5 @@ int arch_cpu_init(void)
 	/* Emmc clock generator: disable the clock multipilier */
 	rk_clrreg(GRF_EMMCCORE_CON11, 0x0ff);
 
-	printf("time %x, %x\n", readl(0xff8680a8), readl(0xff8680ac));
 	return 0;
 }