package/linux-firmware: fix legal-info

Sorry, I was not careful enough when reworking the radeon parts...

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

@@ -16,7 +16,7 @@ endif
 
 ifeq ($(BR2_PACKAGE_LINUX_FIRMWARE_RADEON),y)
 LINUX_FIRMWARE_DIRS += radeon
-LINUX_FIRMWARE_ALL_LICENSE_FILES += LICENCE.radeon
+LINUX_FIRMWARE_ALL_LICENSE_FILES += LICENSE.radeon
 endif
 
 # rt2501/rt61