staging: wlags49_h2: Simplify HCF_ENCAP usage

Encapsulation should always be enabled. Support is either via firmware
or in the driver, so we need to keep the macro. The driver can stop
exporting hcf_encap

Signed-off-by: David Kilroy <kilroyd@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>