Bluetooth: Controller: Fix regression using speed optimization

Fix regression using speed optimization introduced in
commit 1b7fe79 ("Bluetooth: Controller: Support Link
Time Optimizations (LTO)").

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>

Author: cvinayak

subsys/bluetooth/controller/Kconfig.ll_sw_split

@@ -607,7 +607,7 @@ config BT_CTLR_DYNAMIC_INTERRUPTS
 	  permit use of SoC's peripheral for custom use when Bluetooth is not
 	  enabled.
 
-choice
+choice BT_CTLR_OPTIMIZE
 	prompt "Optimization options"
 	depends on !LTO
 	default BT_CTLR_OPTIMIZE_FOR_SPEED
@@ -1256,6 +1256,16 @@ config BT_CTLR_USER_CPR_ANCHOR_POINT_MOVE
 
 endmenu
 
+# Workaround to be able to have default for "choice" in hidden "menu" above
+choice BT_CTLR_OPTIMIZE
+	prompt "Optimization options"
+	depends on !LTO
+
+config BT_CTLR_OPTIMIZE_FOR_SPEED
+	bool "Optimize for Speed"
+
+endchoice
+
 source "subsys/bluetooth/controller/coex/Kconfig"
 
 comment "BLE Controller debug configuration"