armv8: ls1046ardb: update core frequency to 1800MHZ

Update the default core frequency to 1800MHZ for best performance under
SD boot and eMMC boot.

Signed-off-by: Gong Qianyu <Qianyu.Gong@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
2 files changed