linux-firmware: fix support for compressed firmware (#1150)

Fix path used for alternative handling in case linux-firmware has
enabled compressed firmware support.

Author: lumag

recipes-kernel/linux-firmware/linux-firmware_%.bbappend

@@ -6,4 +6,4 @@ inherit ${ALTERNATIVES_CLASS}
 
 # firmware-ath6kl provides updated bdata.bin, which can not be accepted into main linux-firmware repo
 ALTERNATIVE:${PN}-ath6k:qcom = "ar6004-hw13-bdata"
-ALTERNATIVE_LINK_NAME[ar6004-hw13-bdata] = "${nonarch_base_libdir}/firmware/ath6k/AR6004/hw1.3/bdata.bin"
+ALTERNATIVE_LINK_NAME[ar6004-hw13-bdata] = "${nonarch_base_libdir}/firmware/ath6k/AR6004/hw1.3/bdata.bin${@fw_compr_file_suffix(d)}"