spidev-test: Update common-licenses reference

The license files were renamed in oe-core to match the SPDX names.

Most recipes here were already updated in commit ed54f12e


("recipes: Update common-licenses references to match new names"),
but spidev-test was still missing.
Signed-off-by: Daniel Klauer <daniel.klauer@gin.de>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-kernel/spidev-test/spidev-test.bb

 SUMMARY = "Test SPI devices"
 DESCRIPTION = "SPI testing utility using the spidev driver"
 LICENSE = "GPLv2"
-LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/GPL-2.0;md5=801f80980d171dd6425610833a22dbe6"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/GPL-2.0-only;md5=801f80980d171dd6425610833a22dbe6"
 PROVIDES = "virtual/spidev-test"
 
 inherit bash-completion kernelsrc kernel-arch