New kernel configuration options

[ntd]

When building the kernel, the following questions bubbled up interactively.

  Disable unprivileged BPF by default (BPF_UNPRIV_DEFAULT_OFF) [N/y/?] (NEW) 
...
Harden Spectre style attacks against branch history (HARDEN_BRANCH_HISTORY) [Y/n/?] (NEW) 
...
  RT5033 fuel gauge support (BATTERY_RT5033) [N/m/y/?] (NEW) 
...
Choose kernel unwinder
> 1. Frame pointer unwinder (UNWINDER_FRAME_POINTER) (NEW)
  2. ARM EABI stack unwinder (UNWINDER_ARM) (NEW)
choice[1-2?]: 

I left their default values (i.e. hit ENTER).

Is this the correct approach? Is it worth including their new values in ./kernel-patches/config-CX9020?

[pbruenn]

@ntd better late than never, possibly other have the same question. Yes, the generic approach for Kernel (and U-Boot) config is to rely on the defaults, unless you know better. If you have a new config (and new kernel/u-boot) version running, feel free to create a PR.

[ntd]

IIRC, while trying to automate the building, I had to apply this oneline patch to avoid interactive questions on every kernel release. It basically selects automatically the default value on all options not explicitly set by the config file.

With that in place, providing a patch for every new option (i.e. on every kernel release) would be just useless, so I vote for this approach. If you want I can make a PR with only that commit inside... just let me know.

Fill free to close this PR: it is obsolete anyway.