linux-qcom-next: include prune.config to reduce kernel Image size

Added prune.config to KBUILD_CONFIG_EXTRA for aarch64 builds. This
disables configurations for non-target architectures, significantly
reducing kernel size:

Image size: 39.5 MB → 25.7 MB
vmlinux size: 150 MB → 106 MB

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

Author: vkraleti

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

@@ -37,6 +37,7 @@ KBUILD_DEFCONFIG ?= "defconfig"
 KBUILD_DEFCONFIG:qcom-armv7a = "qcom_defconfig"
 
 KBUILD_CONFIG_EXTRA = "${@bb.utils.contains('DISTRO_FEATURES', 'hardened', '${S}/kernel/configs/hardening.config', '', d)}"
+KBUILD_CONFIG_EXTRA:append:aarch64 = "${S}/arch/arm64/configs/prune.config"
 
 do_configure:prepend() {
     # Use a copy of the 'defconfig' from the actual repo to merge fragments