samples: intel_s1000_crb: set CONFIG_NEWLIB_LIBC for math.h

Including math.h requires Newlib so enable it in project
configuration file.

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

samples/boards/intel_s1000_crb/i2s/prj.conf

@@ -11,3 +11,6 @@ CONFIG_I2C=y
 CONFIG_GPIO=y
 CONFIG_I2S=y
 CONFIG_AUDIO=y
+
+# newlib needed for math.h
+CONFIG_NEWLIB_LIBC=y