watchdog: remove the useless watchdog-conf.patch

This patch modifies watchdog.conf file. But this file is deliberately
deleted in do_install. The current mechanism in OE is to use another
recipe watchdog-conf to handle watchdog configuration. So the patch
is really useless.

(From OE-Core rev: 80638247143b15a5643f9fcc116d7bc7dcbf3496)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/watchdog/watchdog/watchdog-conf.patch

@@ -1,16 +0,0 @@
-Signed-off-by: Diego Rondini <diego.ml@zoho.com>
-Upstream-Status: Inappropriate
-
-Index: watchdog-5.15/watchdog.conf
-===================================================================
---- watchdog-5.15.orig/watchdog.conf
-+++ watchdog-5.15/watchdog.conf
-@@ -28,7 +28,7 @@
- #retry-timeout		= 60
- #repair-maximum		= 1
- 
--#watchdog-device	= /dev/watchdog
-+watchdog-device	= /dev/watchdog
- 
- # Defaults compiled into the binary
- #temperature-sensor	=

meta/recipes-extended/watchdog/watchdog_5.15.bb

@@ -12,7 +12,6 @@ SRC_URI = "${SOURCEFORGE_MIRROR}/watchdog/watchdog-${PV}.tar.gz \
            file://0001-Include-linux-param.h-for-EXEC_PAGESIZE-definition.patch \
            file://0001-watchdog-remove-interdependencies-of-watchdog-and-wd.patch \
            file://watchdog-init.patch \
-           file://watchdog-conf.patch \
            file://wd_keepalive.init \
 "