[nrf noup] modules: hal_nordic: require nrf-regtool

Same as commit 6ec9d10 but with the REQUIRED keyword on its own
line to attempt to avoid a merge conflict when reverting/reapplying
this patch.

Signed-off-by: Jonathan Nilsen <[email protected]>
(cherry picked from commit 4e9869f)

Author: jonathannilsen

modules/hal_nordic/CMakeLists.txt

@@ -13,6 +13,7 @@ if(CONFIG_NRF_REGTOOL_GENERATE_UICR)
 endif()
 if(DEFINED nrf_regtool_components)
   find_package(nrf-regtool 9.1.0
+    REQUIRED
     COMPONENTS ${nrf_regtool_components}
     PATHS ${CMAKE_CURRENT_LIST_DIR}/nrf-regtool
     NO_CMAKE_PATH