package/linux-firmware: install missing symlink-target files

AS reported by ovf on IRC, some of the firmwares we install are in fact
symlinks to some other files.

Install those files as well, and document the existing symlinks.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/linux-firmware/linux-firmware.mk

@@ -22,6 +22,8 @@ endif
 
 # rt2xx
 ifeq ($(BR2_PACKAGE_LINUX_FIRMWARE_RALINK_RT2XX),y)
+# rt3090.bin is a symlink to rt2860.bin
+# rt3070.bin is a symlink to rt2870.bin
 LINUX_FIRMWARE_FILES += rt2860.bin rt2870.bin rt3070.bin rt3071.bin rt3090.bin
 LINUX_FIRMWARE_ALL_LICENSE_FILES += LICENCE.ralink-firmware.txt
 endif
@@ -77,6 +79,8 @@ endif
 # sd8688
 ifeq ($(BR2_PACKAGE_LINUX_FIRMWARE_LIBERTAS_SD8688),y)
 LINUX_FIRMWARE_FILES += libertas/sd8688.bin libertas/sd8688_helper.bin
+# The two files above are but symlinks to those two ones:
+LINUX_FIRMWARE_FILES += mrvl/sd8688.bin mrvl/sd8688_helper.bin
 LINUX_FIRMWARE_ALL_LICENSE_FILES += LICENCE.Marvell
 endif
 
@@ -88,6 +92,7 @@ endif
 
 # wl127x
 ifeq ($(BR2_PACKAGE_LINUX_FIRMWARE_TI_WL127X),y)
+# wl1271-nvs.bin is a symlink to wl127x-nvs.bin
 LINUX_FIRMWARE_FILES += \
 	ti-connectivity/wl1271-fw-2.bin				\
 	ti-connectivity/wl1271-fw-ap.bin			\
@@ -123,6 +128,8 @@ LINUX_FIRMWARE_FILES += \
 	ti-connectivity/wl128x-fw-5-plt.bin			\
 	ti-connectivity/wl128x-fw-5-sr.bin			\
 	ti-connectivity/TIInit_7.2.31.bts
+# wl12xx-nvs.bin (above) is a symlink to:
+LINUX_FIRMWARE_FILES += ti-connectivity/wl127x-nvs.bin
 LINUX_FIRMWARE_ALL_LICENSE_FILES += LICENCE.ti-connectivity
 endif
 
@@ -155,9 +162,8 @@ LINUX_FIRMWARE_FILES += \
 endif
 
 ifeq ($(BR2_PACKAGE_LINUX_FIRMWARE_CXGB4),y)
-LINUX_FIRMWARE_FILES += \
-	cxgb4/t4fw-1.9.23.0.bin \
-	cxgb4/t4fw.bin
+# cxgb4/t4fw.bin is a symlink to cxgb4/t4fw-1.9.23.0.bin
+LINUX_FIRMWARE_FILES += cxgb4/t4fw-1.9.23.0.bin cxgb4/t4fw.bin
 LINUX_FIRMWARE_ALL_LICENSE_FILES += LICENCE.chelsio_firmware
 endif
 
@@ -201,7 +207,7 @@ LINUX_FIRMWARE_LICENSE_FILES = $(sort $(LINUX_FIRMWARE_ALL_LICENSE_FILES))
 
 define LINUX_FIRMWARE_INSTALL_TARGET_CMDS
 	mkdir -p $(TARGET_DIR)/lib/firmware
-	$(TAR) c -C $(@D) $(LINUX_FIRMWARE_FILES) | \
+	$(TAR) c -C $(@D) $(sort $(LINUX_FIRMWARE_FILES)) | \
 		$(TAR) x -C $(TARGET_DIR)/lib/firmware
 endef