package/mali-driver: fix legal-info

Fix typo: MALI_DRIVER_LICENSE_FILE -> MALI_DRIVER_LICENSE_FILES
added by commit f3ecd9ea4a40d601317f3b7195be4f5d1bdb3146

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 2f4b73adf85f369ecf00aca675b87ab85099d2f6)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mali-driver/mali-driver.mk

@@ -8,7 +8,7 @@ MALI_DRIVER_VERSION = a742530232d1de41b57465744a1259fa6c35049e
 MALI_DRIVER_SITE = $(call github,bootlin,mali-driver,$(MALI_DRIVER_VERSION))
 MALI_DRIVER_DEPENDENCIES = linux
 MALI_DRIVER_LICENSE = GPL-2.0
-MALI_DRIVER_LICENSE_FILE = LICENSE
+MALI_DRIVER_LICENSE_FILES = LICENSE
 MALI_DRIVER_MODULE_SUBDIRS = r8p0/drivers/gpu/arm/midgard
 
 $(eval $(kernel-module))