Optimization flags for all NRF52 targets to reduce code size (#8854)

* changes of variants/nrf52840/nrf52.ini and variants/nrf52840/rak4631/platformio.ini

* try for nrf52 size reduction, faketec exclude unused radios and meshlink refactor

* can't exclude LR11X0 as in schematic there's option for LR1121

* remove -Map flag and -Wl

* removed spaces causing error

---------

Co-authored-by: macvenez <macvenez@gmail.com>

variants/nrf52840/rak4631/platformio.ini

@@ -12,18 +12,6 @@ build_flags = ${nrf52840_base.build_flags}
   -DRADIOLIB_EXCLUDE_SX128X=1
   -DRADIOLIB_EXCLUDE_SX127X=1
   -DRADIOLIB_EXCLUDE_LR11X0=1
-  -Os
-  -Wl,-Map=$BUILD_DIR/output.map
-build_unflags =
-  -Ofast
-  -Og
-  -ggdb3
-  -ggdb2
-  -g3
-  -g2
-  -g
-  -g1
-  -g0
 build_src_filter = ${nrf52_base.build_src_filter} \
   +<../variants/nrf52840/rak4631> \
   +<mesh/eth/> \