better name for linux' kconfig fragments

Change-Id: Ifa93ee89b53f2f388719059de9ce63e359d911c2
diff --git a/configs/czechlight_epia_geode_defconfig b/configs/czechlight_epia_geode_defconfig
index 7a1beed..07792dc 100644
--- a/configs/czechlight_epia_geode_defconfig
+++ b/configs/czechlight_epia_geode_defconfig
@@ -23,7 +23,7 @@
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.14.4"
 BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
-BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/kconfig $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/epia_geode/kconfig"
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/linux.fragment $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/epia_geode/linux.fragment"
 BR2_LINUX_KERNEL_INSTALL_TARGET=y
 BR2_PACKAGE_LINUX_TOOLS_GPIO=y
 BR2_PACKAGE_LINUX_TOOLS_PERF=y