[nrf toup] [nrfconnect] Switch to picolib

Switched from newlibc to picolibc in Nordic platform.

Signed-off-by: Arkadiusz Balys <[email protected]>

Author: ArekBalysNordic

config/nrfconnect/chip-module/Kconfig.defaults

@@ -25,7 +25,12 @@ if CHIP
 # ==============================================================================
 
 choice LIBC_IMPLEMENTATION
-    default NEWLIB_LIBC
+    default PICOLIBC
+endchoice
+
+choice POSIX_SYSCONF_IMPL_CHOICE
+    default POSIX_SYSCONF_IMPL_MACRO if PICOLIBC
+
 endchoice
 
 config ASSERT
@@ -57,6 +62,7 @@ if CHIP_WIFI
 
 config HEAP_MEM_POOL_SIZE
     default 48336 if BUILD_WITH_TFM
+    default 43008 if CHIP_WIFI
     default 40144
 
 config NRF_WIFI_DATA_HEAP_SIZE
@@ -70,6 +76,7 @@ config HEAP_MEM_POOL_IGNORE_MIN
 
 config CHIP_MALLOC_SYS_HEAP_SIZE
     default 10240 if SOC_SERIES_NRF54LX # nRF54L requires more memory due to crypto backend
+    default 14336 if CHIP_WIFI
     default 8192 if OPENTHREAD
 
 config MPSL_WORK_STACK_SIZE