icE1usb fw: Add _MASK version for multibit fields in config regs

This is a bit cleaner when masking in/out those rather than using
the specific vaue that has all bits set.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: If2ca8efff37cb8fd1f1841656537ea8ad11ef55c
2 files changed