[][MAC80211][core][Fix build fail w/ new ATF]

[Description]
Fix build fail w/ new ATF.

MAC80211 new ATF mechanism uses include/minmax.h.
"kernel.h: split out min()/max() et al. helpers" is merged in Kernel 5.10.
Hack to use include/kernel.h for Kernel 5.4

[Release-log]
N/A

Change-Id: I3cf7ef82af9559021bb96e8b5b72798bfa8d2d99
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6074159
diff --git a/autobuild_mac80211_release/package/kernel/mac80211/patches/subsys/907-mac80211-fix-331-include-minmax-fail.patch b/autobuild_mac80211_release/package/kernel/mac80211/patches/subsys/907-mac80211-fix-331-include-minmax-fail.patch
new file mode 100644
index 0000000..aa96a7e
--- /dev/null
+++ b/autobuild_mac80211_release/package/kernel/mac80211/patches/subsys/907-mac80211-fix-331-include-minmax-fail.patch
@@ -0,0 +1,16 @@
+diff --git a/include/linux/skiplist.h b/include/linux/skiplist.h
+index 2312ed8..0677cb7 100644
+--- a/include/linux/skiplist.h
++++ b/include/linux/skiplist.h
+@@ -56,7 +56,7 @@
+ #define __SKIPLIST_H
+ 
+ #include <linux/bits.h>
+-#include <linux/minmax.h>
++#include <linux/kernel.h>
+ #include <linux/bug.h>
+ #include <linux/prandom.h>
+ 
+-- 
+2.29.2
+