modules: tf-m: Add fallback __assert_no_args

This fixes a build issue when building TF-M debug
configurations. Adds a weak implementation of
__assert_no_args which simply calls TF-M core panic.
The issue was triggered by the tfm_hello_world sample  with
sample.tfm.hello_world.bootloaders_debug configuration.

Signed-off-by: Georgios Vasilakis <georgios.vasilakis@nordicsemi.no>

Author: Vge0rge

modules/trusted-firmware-m/tfm_boards/common/assert.c

@@ -68,3 +68,14 @@
 #endif
 
 #endif /* CONFIG_PARTITION_MANAGER_ENABLED */
+
+/* picolibc's <assert.h> expands assert() into a call to __assert_no_args() when
+ * NDEBUG and ASSERT_VERBOSE are not defined. The TF-M secure image is linked with -nostdlib
+ * (since it defaults to TFM_INCLUDE_STDLIBC=n), so  in some configurations this results
+ * to undefined reference to __assert_no_args() when assert() is used in the TF-M secure image.
+ * Make it weak so that that acts a fallback implementation.
+ */
+__WEAK __NO_RETURN void __assert_no_args(void)
+{
+	tfm_core_panic();
+}