CMake: Fix wrong file name of entropy_stm32.c

Signed-off-by: Ding Tao <miyatsu@qq.com>
diff --git a/drivers/entropy/CMakeLists.txt b/drivers/entropy/CMakeLists.txt
index aff6939..1a83fc3 100644
--- a/drivers/entropy/CMakeLists.txt
+++ b/drivers/entropy/CMakeLists.txt
@@ -2,5 +2,5 @@
 zephyr_sources_ifdef(CONFIG_ENTROPY_MCUX_RNGA          entropy_mcux_rnga.c)
 zephyr_sources_ifdef(CONFIG_ENTROPY_MCUX_TRNG          entropy_mcux_trng.c)
 zephyr_sources_ifdef(CONFIG_ENTROPY_NRF5_RNG           entropy_nrf5.c)
-zephyr_sources_ifdef(CONFIG_ENTROPY_STM32_RNG          entropy_stm32_rng.c)
+zephyr_sources_ifdef(CONFIG_ENTROPY_STM32_RNG          entropy_stm32.c)
 zephyr_sources_ifdef(CONFIG_USERSPACE                  entropy_handlers.c)