MIPS: BCM63XX: Be consistent in clock bits enable naming

Remove the _CLK suffix from the BCM6368 clock bits definitions to be
consistent with what is already present.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3312/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>