i2c-tools: use upstream tarball

Tarballs of the releases are now again available:

https://www.spinics.net/lists/linux-i2c/msg30349.html

So change back to that instead of getting the source code from git.

While we're at it, add a hash for the license file.

[Peter: Also update Config.in homepage URL as pointed out by Baruch]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/i2c-tools/Config.in

@@ -8,4 +8,4 @@ config BR2_PACKAGE_I2C_TOOLS
 	  a bus probing tool, a chip dumper, register-level access helpers,
 	  EEPROM decoding scripts, and more.
 
-	  http://www.lm-sensors.org/wiki/I2CTools
+	  https://i2c.wiki.kernel.org/index.php/I2C_Tools

package/i2c-tools/i2c-tools.hash

@@ -1,2 +1,5 @@
 # Locally computed
-sha256 972b8da73b5aada91e8f21573cf5dbf6dc2d5d64864210e80b2b1aa710a66d02  i2c-tools-v3.1.2.tar.gz
+sha256 6d6079153cd49a62d4addacef4c092db1a46ba60b2807070a3fbe050262aef87  i2c-tools-3.1.2.tar.xz
+
+# License file
+sha256 ab15fd526bd8dd18a9e77ebc139656bf4d33e97fc7238cd11bf60e2b9b8666c6  COPYING

package/i2c-tools/i2c-tools.mk

@@ -4,8 +4,9 @@
 #
 ################################################################################
 
-I2C_TOOLS_VERSION = v3.1.2
-I2C_TOOLS_SITE = git://git.kernel.org/pub/scm/utils/i2c-tools/i2c-tools.git
+I2C_TOOLS_VERSION = 3.1.2
+I2C_TOOLS_SOURCE = i2c-tools-$(I2C_TOOLS_VERSION).tar.xz
+I2C_TOOLS_SITE = https://www.kernel.org/pub/software/utils/i2c-tools
 I2C_TOOLS_LICENSE = GPL-2.0+, GPL-2.0 (py-smbus)
 I2C_TOOLS_LICENSE_FILES = COPYING