[nrf fromlist] modules: hal_nordic: cmake: Fix checking if uicr DT node is accessible

According to cmake documentation, in the `if(<string>)` expression
the string evaluates to false unless its value is one of the true
constants. Thus, the commands under `if(${uicr_path})` are never
executed. Use `if(DEFINED uicr_path)` instead, since `uicr_path`
is returned by `dt_nodelabel()` and it will be undefined if such
node does not exist.

Signed-off-by: Andrzej Głąbek <[email protected]>

Upstream PR: zephyrproject-rtos/zephyr#63929

Author: anangl

modules/hal_nordic/nrfx/CMakeLists.txt

@@ -116,7 +116,7 @@ endif()
 # doing the proper configuration sequence during system init
 
 dt_nodelabel(uicr_path NODELABEL "uicr")
-if(${uicr_path})
+if(DEFINED uicr_path)
   dt_prop(nfct_pins_as_gpios PATH ${uicr_path} PROPERTY "nfct-pins-as-gpios")
   if(${nfct_pins_as_gpios})
     zephyr_library_compile_definitions(CONFIG_NFCT_PINS_AS_GPIOS)