Revert "[nrf fromtree] net: openthread: Added config options for NCP vendor hooks."

This reverts commit f4ff4f0.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>

Author: rlubos

subsys/net/l2/openthread/Kconfig

@@ -316,12 +316,6 @@ config OPENTHREAD_NCP_SPINEL_ON_UART_ACM
 	help
 	  Is the SPINEL device a USB-CDC-ACM device
 
-config OPENTHREAD_NCP_VENDOR_HOOK_SOURCE
-	string "Path to NCP vendor hook source file"
-	depends on OPENTHREAD_NCP
-	help
-	  Provides path to compile ncp vendor hook file inside NCP component
-
 config OPENTHREAD_UDP_FORWARD
 	bool "UDP forward support"
 	help