linux (RPi/Generic/Allwinner): revert faulty Bluetooth commit

https://forum.kodi.tv/showthread.php?tid=343069&pid=2858940#pid2858940
https://forum.kodi.tv/showthread.php?tid=343068&pid=2859150#pid2859150

packages/linux/patches/raspberrypi/linux-999.99-revert-faulty-bt-encryption-commit.patch

@@ -0,0 +1,48 @@
+From aa843e35a472a2aff26250662d21ff30629d294c Mon Sep 17 00:00:00 2001
+From: MilhouseVH <milhouseVH.github@nmacleod.com>
+Date: Wed, 5 Jun 2019 16:35:18 +0100
+Subject: [PATCH] Revert "Bluetooth: Align minimum encryption key size for LE
+ and BR/EDR connections"
+
+This reverts commit 07e38998a19d72b916c39a983c19134522ae806b.
+---
+ include/net/bluetooth/hci_core.h | 3 ---
+ net/bluetooth/hci_conn.c         | 8 --------
+ 2 files changed, 11 deletions(-)
+
+diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
+index 05b1b96..094e61e 100644
+--- a/include/net/bluetooth/hci_core.h
++++ b/include/net/bluetooth/hci_core.h
+@@ -190,9 +190,6 @@ struct adv_info {
+ 
+ #define HCI_MAX_SHORT_NAME_LENGTH	10
+ 
+-/* Min encryption key size to match with SMP */
+-#define HCI_MIN_ENC_KEY_SIZE		7
+-
+ /* Default LE RPA expiry time, 15 minutes */
+ #define HCI_DEFAULT_RPA_TIMEOUT		(15 * 60)
+ 
+diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
+index 3cf0764..bd4978c 100644
+--- a/net/bluetooth/hci_conn.c
++++ b/net/bluetooth/hci_conn.c
+@@ -1276,14 +1276,6 @@ int hci_conn_check_link_mode(struct hci_conn *conn)
+ 	    !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
+ 		return 0;
+ 
+-	/* The minimum encryption key size needs to be enforced by the
+-	 * host stack before establishing any L2CAP connections. The
+-	 * specification in theory allows a minimum of 1, but to align
+-	 * BR/EDR and LE transports, a minimum of 7 is chosen.
+-	 */
+-	if (conn->enc_key_size < HCI_MIN_ENC_KEY_SIZE)
+-		return 0;
+-
+ 	return 1;
+ }
+ 
+-- 
+2.14.1
+