[nrf noup] modules: hal_nordic: cleanup nrfx_config

- Remove temporary workaround for SDC in nrfx's reserved resources.
- Modify NCS reserved resources to use upstream version with additions
  instead of creating new file
- Align filename

Signed-off-by: Marcin Szymczyk <marcin.szymczyk@nordicsemi.no>

Author: masz-nordic

modules/hal_nordic/nrfx/Kconfig

@@ -1308,6 +1308,6 @@ endmenu
 
 config NRFX_RESERVED_RESOURCES_HEADER
 	string
-	default "nrfx_config_reserved_resources_ncs.h"
+	default "nrfx_reserved_resources_ncs.h"
 
 endmenu # "nrfx drivers"