package/linux-firmware: remove imx sdma firmware

As reported on the mailing list [1], the imx sdma firmwares for
imx[6,7,8] are provided by two packages: firmware-imx and
linux-firmware

$ sha256sum ./firmware-imx-8.10/firmware/sdma/sdma-imx6q.bin
7790c161b7e013a9dbcbffb17cc5d4cb63d952949a505647e4679f02d04c4784
./firmware-imx-8.10/firmware/sdma/sdma-imx6q.bin

$ sha256sum  ./linux-firmware-20201022/imx/sdma/sdma-imx6q.bin
7790c161b7e013a9dbcbffb17cc5d4cb63d952949a505647e4679f02d04c4784
./linux-firmware-20201022/imx/sdma/sdma-imx6q.bin

firmware-imx also has firmwares for older variants as well, so this is
what we keep as the only imx sdma firmware provider.

[1] http://lists.busybox.net/pipermail/buildroot/2021-January/300938.html

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Stephane Viau <stephane.viau@oss.nxp.com>
Cc: Gary Bisson <gary.bisson@boundarydevices.com>
[yann.morin.1998@free.fr: explain why we keep firmware-imx]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

Config.in.legacy

@@ -146,6 +146,14 @@ endif
 
 comment "Legacy options removed in 2021.02"
 
+config BR2_PACKAGE_LINUX_FIRMWARE_IMX_SDMA
+	bool "imx sdma firmware is provided by firmware-imx"
+	select BR2_LEGACY
+	select BR2_PACKAGE_FIRMWARE_IMX
+	help
+	  linux-firmware provide the same firmware as firmware-imx.
+	  We prefer using firmware-imx as the only provider.
+
 config BR2_GDB_VERSION_8_2
 	bool "gdb 8.2.x has been removed"
 	select BR2_LEGACY

package/linux-firmware/Config.in

@@ -459,15 +459,6 @@ config BR2_PACKAGE_LINUX_FIRMWARE_XCx000
 
 endmenu
 
-menu "SoC Firmware"
-
-config BR2_PACKAGE_LINUX_FIRMWARE_IMX_SDMA
-	bool "Freescale i.MX SDMA"
-	help
-	  Firmware files for i.MX SDMA.
-
-endmenu
-
 menu "Fibre Channel Adapter Firmware"
 
 config BR2_PACKAGE_LINUX_FIRMWARE_QLOGIC_2XXX

package/linux-firmware/linux-firmware.mk

@@ -64,12 +64,6 @@ LINUX_FIRMWARE_FILES += qca/rampatch_usb_00000302.bin qca/nvm_usb_00000302.bin
 LINUX_FIRMWARE_ALL_LICENSE_FILES += LICENSE.qcom
 endif
 
-# Freescale i.MX SDMA
-ifeq ($(BR2_PACKAGE_LINUX_FIRMWARE_IMX_SDMA),y)
-LINUX_FIRMWARE_FILES += imx/sdma/sdma-imx6q.bin imx/sdma/sdma-imx7d.bin
-LINUX_FIRMWARE_ALL_LICENSE_FILES += LICENSE.sdma_firmware
-endif
-
 # rt2501/rt61
 ifeq ($(BR2_PACKAGE_LINUX_FIRMWARE_RALINK_RT61),y)
 LINUX_FIRMWARE_FILES += rt2561.bin rt2561s.bin rt2661.bin