subsys/bluetooth: Misc native_posix cleanup

Remove a kconfig dependency on BOARD_NATIVE_POSIX which
does not really exist anymore.
Replace a comment mention of native_posix with native_posix.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
diff --git a/subsys/bluetooth/common/Kconfig b/subsys/bluetooth/common/Kconfig
index 56dd33c..6159d2f 100644
--- a/subsys/bluetooth/common/Kconfig
+++ b/subsys/bluetooth/common/Kconfig
@@ -264,7 +264,7 @@
 config BT_HCI_VS_EXT_DETECT
 	bool "Use heuristics to guess HCI vendor extensions support in advance"
 	depends on BT_HCI_VS && !HAS_BT_CTLR
-	default y if BOARD_QEMU_X86 || BOARD_QEMU_CORTEX_M3 || BOARD_NATIVE_POSIX || BOARD_NATIVE_SIM
+	default y if BOARD_QEMU_X86 || BOARD_QEMU_CORTEX_M3 || BOARD_NATIVE_SIM
 	help
 	  Use some heuristics to try to guess in advance whether the controller
 	  supports the HCI vendor extensions in advance, in order to prevent
diff --git a/subsys/bluetooth/controller/hci/hci_driver.c b/subsys/bluetooth/controller/hci/hci_driver.c
index 1f856e5..0afca4f 100644
--- a/subsys/bluetooth/controller/hci/hci_driver.c
+++ b/subsys/bluetooth/controller/hci/hci_driver.c
@@ -287,7 +287,7 @@
 	 * reinitialize the queue so it is empty, we use the cancel wait and
 	 * initialize the queue. As the Tx thread and Rx thread are co-operative
 	 * we should be relatively safe doing the below.
-	 * Added k_sched_lock and k_sched_unlock, as native_posix seems to
+	 * Added k_sched_lock and k_sched_unlock, as native_sim seems to
 	 * swap to waiting thread on call to k_fifo_cancel_wait!.
 	 */
 	k_sched_lock();