staging: wfx: change the field chip_frozen into a boolean

The field chip_frozen is declared as an integer, but it is only used as
a boolean. So, convert it into a boolean.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200427134031.323403-3-Jerome.Pouiller@silabs.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>