config: Fix kconfig warnings

We're getting the following warnings:

```
 #13 4.361 .config:85:warning: override: reassigning to symbol DEBUG_INFO_BTF
 #13 4.361 .config:86:warning: override: DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT changes choice state
 #13 4.361 .config:208:warning: override: reassigning to symbol VSOCKETS
```

The first and last are legit - we are double assigning. So just delete
the second assignments.

The middle we want to keep. It's probably safer to use the latest DWARF
version possible - pahole will be able to handle it. Older versions, who
knows. Safer to stay on bleeding edge, as it's what BPF subsystem tests
with.

config/config

@@ -11,6 +11,7 @@ CONFIG_BPF_SYSCALL=y
 CONFIG_DEBUG_INFO=y
 CONFIG_DEBUG_INFO_BTF=y
 CONFIG_DEBUG_INFO_DWARF4=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_DEBUG_KERNEL=y
 CONFIG_DUMMY=y
 CONFIG_DYNAMIC_FTRACE=y

config/config.x86_64

@@ -42,8 +42,6 @@ CONFIG_CRYPTO_BLAKE2B=y
 CONFIG_CRYPTO_SEQIV=y
 CONFIG_CRYPTO_XXHASH=y
 CONFIG_DCB=y
-CONFIG_DEBUG_INFO_BTF=y
-CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 CONFIG_X86_DECODER_SELFTEST=n
 CONFIG_DEFAULT_FQ_CODEL=y
 CONFIG_DEFAULT_RENO=y
@@ -165,7 +163,6 @@ CONFIG_VALIDATE_FS_PARSER=y
 CONFIG_VETH=y
 CONFIG_VIRT_DRIVERS=y
 CONFIG_VLAN_8021Q=y
-CONFIG_VSOCKETS=y
 CONFIG_VSOCKETS_LOOPBACK=y
 CONFIG_X86_ACPI_CPUFREQ=y
 CONFIG_X86_CPUID=y