linux-qcom-next: fix missing space when appending prune.config

Add a leading space when appending prune.config to KBUILD_CONFIG_EXTRA.
Without this, configs may concatenate incorrectly, causing build issues.

This addresses a regression introduced by commit d1e9628.

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

Author: vkraleti

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

@@ -37,7 +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"
+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