ARM: HYP/non-sec: Fix the ARCH Timer frequency setting for sun7i

Earlier commit 73a1cb27 mistakenly used CONFIG_SYS_TIMER_CLK_FREQ.
It should be CONFIG_TIMER_CLK_FREQ.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
[York Sun: This is the difference between two patch versions]
Reviewed-by: York Sun <yorksun@freescale.com>