pal: fix misspelled Kconfig in CMakeLists.txt

Add missing CONFIG_ prefix to CONFIG_DEPRECATED_SIDEWALK_PAL_INIT
Kconfig to *actually* allow the use of the deprecated pal_init.c file.

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

subsys/sal/sid_pal/src/CMakeLists.txt

@@ -71,6 +71,6 @@ endif() # CONFIG_SOC_NRF52840
 
 zephyr_library_sources_ifdef(CONFIG_SIDEWALK sid_common.c)
 
-zephyr_library_sources_ifdef(DEPRECATED_SIDEWALK_PAL_INIT pal_init.c)
+zephyr_library_sources_ifdef(CONFIG_DEPRECATED_SIDEWALK_PAL_INIT pal_init.c)
 
 zephyr_library_sources(bt_app_callbacks.c)