[][Fix system timer clock rate]

[Description]
Fix system timer clock rate
We have set EL0_CNTFRQ to 13Mhz in atf BL2,
Remove this wrong value to fix system timer slow-down issue

[Release-log]
N/A

Change-Id: I1b7cd7faf3ba7a772d710536ea6c9fc2f95905ae
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5260232
1 file changed