brcmfmac: only build fwsignal module for CONFIG_BRCMFMAC_PROTO_BCDC

The fwsignal module is only referenced by the bcdc module and part of the
bcdc protocol. So only build it when CONFIG_BRCMFMAC_PROTO_BCDC is selected.

Fixes: acf8ac41dd73 ("brcmfmac: remove reference to fwsignal data from struct brcmf_pub")
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/Makefile

@@ -25,7 +25,6 @@ brcmfmac-objs += \
 		chip.o \
 		fwil.o \
 		fweh.o \
-		fwsignal.o \
 		p2p.o \
 		proto.o \
 		common.o \
@@ -36,7 +35,8 @@ brcmfmac-objs += \
 		vendor.o \
 		pno.o
 brcmfmac-$(CONFIG_BRCMFMAC_PROTO_BCDC) += \
-		bcdc.o
+		bcdc.o \
+		fwsignal.o
 brcmfmac-$(CONFIG_BRCMFMAC_PROTO_MSGBUF) += \
 		commonring.o \
 		flowring.o \