package/spidev_test: fix spidev_test.c version in Config.in help text

- fix spidev_test.c version in Config.in help text, version update to 4.10
  (missing from commit 'spidev_test: bump to version in Linux 4.10' [1])

[1] https://git.buildroot.net/buildroot/commit/?id=a497a9fd6cdb518572282b1478279f476f870fb7

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/spidev_test/Config.in

@@ -9,7 +9,7 @@ config BR2_PACKAGE_SPIDEV_TEST
 	  proper operation of 'spidev_test'.
 
 	  The version used is based on your toolchain headers version,
-	  if it's older than 3.15 then 3.0 is used, otherwise 3.15
+	  if it's older than 3.15 then 3.0 is used, otherwise 4.10
 	  is used.
 	  This means you won't have quad-pumped SPI support if your
 	  toolchain is too old.