driver: ieee802154: remove deprecated Kconfigs

The following Kconfigs have been deprecated for more than 2
releases, remove them:

- `IEEE802154_CC13XX_CC26XX_SUB_GHZ_RADIO_TX_RETRIES`
- `CONFIG_IEEE802154_2015`

Signed-off-by: Yong Cong Sin <[email protected]>

Author: ycsin

drivers/ieee802154/Kconfig

@@ -80,12 +80,6 @@ source "drivers/ieee802154/Kconfig.dw1000"
 
 source "drivers/ieee802154/Kconfig.uart_pipe"
 
-config IEEE802154_2015
-	bool "Support for IEEE 802.15.4-2015 frames (DEPRECATED)"
-	select DEPRECATED
-	help
-	  Enable radio driver support for IEEE 802.15.4-2015 frames, including security handling of frames and ACKs.
-
 config IEEE802154_CSL_ENDPOINT
 	bool "Support for CSL Endpoint"
 	help

drivers/ieee802154/Kconfig.cc13xx_cc26xx

@@ -88,12 +88,6 @@ config IEEE802154_CC13XX_CC26XX_SUB_GHZ_INIT_PRIO
 	help
 	  Set the initialization priority number.
 
-config IEEE802154_CC13XX_CC26XX_SUB_GHZ_RADIO_TX_RETRIES
-	bool
-	select DEPRECATED
-	help
-	  DEPRECATED - use NET_L2_IEEE802154_RADIO_TX_RETRIES instead
-
 config IEEE802154_CC13XX_CC26XX_SUB_GHZ_CUSTOM_RADIO_SETUP
 	bool "Use custom radio setup structures (advanced)"
 	default n