Fix some configuration differences between GN & automake

[mspang]

The standalone project configs now apply unless specifically overriden,
which matches configure's behavior. Previously the project configs were
disabled by default, so the defaults inline in CHIPConfig.h applied.

Note there are at 3 sources of defaults here which lead to this
confusion:

(1) The defaults used by scripts/build/bootstrap.sh, which calls
configure with few arguments. This uses the standalone
project configs and builds tests.

(2) The defaults used by config/standalone/standalone-chip.mk, which
calls configure and overrides some arguments. This uses the
standalone project configs, but disables some components, and
does not build tests.

(3) The defaults specified directly in CHIPConfig.h et al. These
defaults may have no effect because configure always overrides
them using BuildConfig.h. GN currently doesn't use BuildConfig.h,
but uses the command line to get the same result.

[github-actions]

Size increase report for "nrf-example-build"

File	Section	File	VM

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-nrf52840-lock-example.out and ./pull_artifact/chip-nrf52840-lock-example.out:

sections,vmsize,filesize

[github-actions]

Size increase report for "linux-example-build"

File	Section	File	VM

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-standalone-demo.out and ./pull_artifact/chip-standalone-demo.out:

sections,vmsize,filesize

[github-actions]

Size increase report for "esp32-example-build"

File	Section	File	VM

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-wifi-echo.elf and ./pull_artifact/chip-wifi-echo.elf:

sections,vmsize,filesize

[github-actions]

Size increase report for "gn_nrf-example-build"

File	Section	File	VM

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

[github-actions]

Size increase report for "gn_linux-example-build"

File	Section	File	VM

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv