staging: wfx: remove unused definition

The enum hif_fw_type is never used in the driver. Drop it.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20210913130203.1903622-22-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/hif_api_general.h

@@ -113,12 +113,6 @@ enum hif_api_rate_index {
 	API_RATE_NUM_ENTRIES       = 22
 };
 
-enum hif_fw_type {
-	HIF_FW_TYPE_ETF  = 0x0,
-	HIF_FW_TYPE_WFM  = 0x1,
-	HIF_FW_TYPE_WSM  = 0x2
-};
-
 struct hif_ind_startup {
 	// As the others, this struct is interpreted as little endian by the
 	// device. However, this struct is also used by the driver. We prefer to