iso: Add BTF debug symbols to support eBPF tooling

This change sets kernel option CONFIG_DEBUG_INFO_BTF so that BTF type
information is generated, which is necessary for eBPF-based tooling such
as Tetragon to work. Additionally, for x86_64 only, it adds the recommended
option CONFIG_BPF_KPROBE_OVERRIDE to also support policy enforcement.

Setting CONFIG_DEBUG_INFO_BTF also requires setting
CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT. Setting
CONFIG_BPF_KPROBE_OVERRIDE also requires setting
CONFIG_FUNCTION_ERROR_INJECTION.

Author: blu3r4y

deploy/iso/minikube-iso/board/minikube/aarch64/linux_aarch64_defconfig

@@ -947,7 +947,7 @@ CONFIG_CMA_SIZE_MBYTES=32
 CONFIG_PRINTK_TIME=y
 CONFIG_DEBUG_KERNEL=y
 CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
-CONFIG_DEBUG_INFO_REDUCED=y
+CONFIG_DEBUG_INFO_BTF=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_FS=y
 # CONFIG_SCHED_DEBUG is not set

deploy/iso/minikube-iso/board/minikube/x86_64/linux_x86_64_defconfig

@@ -502,13 +502,17 @@ CONFIG_CRYPTO_USER_API_SKCIPHER=y
 CONFIG_CRYPTO_AES_NI_INTEL=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DEBUG_KERNEL=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
+CONFIG_DEBUG_INFO_BTF=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_STACK_USAGE=y
 # CONFIG_SCHED_DEBUG is not set
 CONFIG_SCHEDSTATS=y
 CONFIG_FUNCTION_TRACER=y
 CONFIG_FTRACE_SYSCALLS=y
 CONFIG_BLK_DEV_IO_TRACE=y
+CONFIG_BPF_KPROBE_OVERRIDE=y
 CONFIG_PROVIDE_OHCI1394_DMA_INIT=y
 CONFIG_EARLY_PRINTK_DBGP=y
 CONFIG_DEBUG_BOOT_PARAMS=y
+CONFIG_FUNCTION_ERROR_INJECTION=y