linux-qcom-next: introduce KBUILD_CONFIG_EXTRA for in-tree kernel configs

Currently, CONFIG_LIST lists both in-tree kernel config fragments as well as
external *.cfg files provided via SRC_URI. Mixing these makes it harder to
control which fragments are applied internally versus externally.

Introduce a new variable, KBUILD_CONFIG_EXTRA, aligned with Kbuild naming
conventions to handle internal kernel configuration fragments such as
hardening.config. External fragments remain controlled through SRC_URI,
so no separate list is needed for those.

The do_configure step now merges:
  - Base defconfig from arch/${ARCH}/configs
  - External fragments from find_cfgs(d)
  - In-tree fragments from KBUILD_CONFIG_EXTRA

Signed-off-by: Viswanath Kraleti <[email protected]>

Author: vkraleti

recipes-kernel/linux/linux-qcom-next_git.bb

@@ -36,13 +36,12 @@ S = "${UNPACKDIR}/${BP}"
 KBUILD_DEFCONFIG ?= "defconfig"
 KBUILD_DEFCONFIG:qcom-armv7a = "qcom_defconfig"
 
-CONFIG_LIST =  "${@" ".join(find_cfgs(d))}"
-CONFIG_LIST += "${@bb.utils.contains('DISTRO_FEATURES', 'hardened', '${S}/kernel/configs/hardening.config', '', d)}"
+KBUILD_CONFIG_EXTRA = "${@bb.utils.contains('DISTRO_FEATURES', 'hardened', '${S}/kernel/configs/hardening.config', '', d)}"
 
 do_configure:prepend() {
     # Use a copy of the 'defconfig' from the actual repo to merge fragments
     cp ${S}/arch/${ARCH}/configs/${KBUILD_DEFCONFIG} ${B}/.config
 
     # Merge fragment for QCOM value add features
-    ${S}/scripts/kconfig/merge_config.sh -m -O ${B} ${B}/.config ${CONFIG_LIST}
+    ${S}/scripts/kconfig/merge_config.sh -m -O ${B} ${B}/.config ${@" ".join(find_cfgs(d))} ${KBUILD_CONFIG_EXTRA}
 }