doc: include settings RT API

Corrected doxygen predefinition for run-time API
inclusion into doxygen build.

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

Author: nvlsianpu

doc/zephyr.doxyfile.in

@@ -1980,7 +1980,7 @@ PREDEFINED             = "CONFIG_ARCH_HAS_CUSTOM_BUSY_WAIT" \
                          "CONFIG_SCHED_CPU_MASK" \
                          "CONFIG_SCHED_DEADLINE" \
                          "CONFIG_SCHED_DEADLINE" \
-                         "CONFIG_SETTINGS_RUNTIME=y" \
+                         "CONFIG_SETTINGS_RUNTIME" \
                          "CONFIG_SMP" \
                          "CONFIG_SPI_ASYNC" \
                          "CONFIG_SYS_CLOCK_EXISTS" \