app/prj.conf: disable PICOLIBC with CONFIG_MINIMAL_LIBC=y

Starting from Zephyr commit f0daf904bb02, CONFIG_PICOLIBC is on by
default.

PICOLIBC does not seem compatible with sparse yet:
zephyrproject-rtos/zephyr#63003

Even if it were compatible with sparse, it seems like a pretty big
change that we should not immediately and blindly accept.

Signed-off-by: Marc Herbert <marc.herbert@intel.com>

app/prj.conf

@@ -14,6 +14,11 @@ CONFIG_OUTPUT_DISASSEMBLY=y
 
 CONFIG_HAVE_AGENT=n
 
+# PICOLIBC does not seem compatible with the "sparse" static analyzer
+# yet, see https://github.com/zephyrproject-rtos/zephyr/issues/63003
+# Plus the paint on it is still wet.
+CONFIG_MINIMAL_LIBC=y
+
 CONFIG_LOG=y
 CONFIG_LOG_PRINTK=y
 # Log processing is offloaded to a low-priority thread.