drivers: i3c: Use kernel heap for allocations

Use the kernel heap instead of the libc heap, improving
security and consistency.

Signed-off-by: Ibrahim Abdalkader <i.abdalkader@gmail.com>

drivers/i3c/Kconfig

@@ -58,6 +58,14 @@ config I3C_TARGET_BUFFER_MODE
 	help
 	  This is an option to enable buffer mode.
 
+config HEAP_MEM_POOL_ADD_SIZE_I3C
+	int "Heap memory pool size for I3C"
+	default 48
+	depends on I3C_CONTROLLER && I3C_TARGET
+	help
+	  The size of the memory pool used by I3C. Used only for
+	  DEFTGTS (Define List of Targets) CCC (Common Command Code).
+
 menuconfig I3C_USE_IBI
 	bool "Use In-Band Interrupt (IBI)"
 	default y

drivers/i3c/i3c_common.c

@@ -7,6 +7,7 @@
 #include <string.h>
 #include <stdlib.h>
 
+#include <zephyr/kernel.h>
 #include <zephyr/toolchain.h>
 #include <zephyr/sys/__assert.h>
 #include <zephyr/sys/slist.h>
@@ -1327,7 +1328,7 @@ int i3c_bus_deftgts(const struct device *dev)
 	}
 
 	/* Allocate memory for the struct with enough space for the targets */
-	deftgts = malloc(data_len);
+	deftgts = k_malloc(data_len);
 	if (!deftgts) {
 		return -ENOMEM;
 	}
@@ -1371,7 +1372,7 @@ int i3c_bus_deftgts(const struct device *dev)
 
 	ret = i3c_ccc_do_deftgts_all(dev, deftgts);
 
-	free(deftgts);
+	k_free(deftgts);
 
 	return ret;
 }