[PATCH] clk: stm32: allow STM32MP COMPILE_TEST builds

[Rosen Penev <rosenp@gmail.com>]

COMMON_CLK_STM32MP already allows COMPILE_TEST, but the parent clock
Makefile only descends into drivers/clk/stm32 for ARCH_STM32.  Use the
STM32MP clock symbol for that directory gate instead.

Building the STM32MP21 and STM32MP25 clock drivers then requires direct
linux/bitfield.h includes for FIELD_GET(), so add them as part of exposing
that compile-test coverage.

Tested with:
make LLVM=1 ARCH=loongarch drivers/clk/stm32/

Assisted-by: Codex:GPT-5.5
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/clk/Makefile              | 2 +-
 drivers/clk/stm32/clk-stm32mp21.c | 1 +
 drivers/clk/stm32/clk-stm32mp25.c | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 9c3a9703ad92..0cd2223de3ca 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -150,7 +150,7 @@ obj-y					+= spacemit/
 obj-$(CONFIG_PLAT_SPEAR)		+= spear/
 obj-y					+= sprd/
 obj-$(CONFIG_ARCH_STI)			+= st/
-obj-$(CONFIG_ARCH_STM32)		+= stm32/
+obj-$(CONFIG_COMMON_CLK_STM32MP)	+= stm32/
 obj-y					+= starfive/
 obj-$(CONFIG_ARCH_SUNXI)		+= sunxi/
 obj-y					+= sunxi-ng/
diff --git a/drivers/clk/stm32/clk-stm32mp21.c b/drivers/clk/stm32/clk-stm32mp21.c
index c8a37b716bd5..3c143371c77e 100644
--- a/drivers/clk/stm32/clk-stm32mp21.c
+++ b/drivers/clk/stm32/clk-stm32mp21.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/bus/stm32_firewall_device.h>
+#include <linux/bitfield.h>
 #include <linux/clk-provider.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
diff --git a/drivers/clk/stm32/clk-stm32mp25.c b/drivers/clk/stm32/clk-stm32mp25.c
index 52f0e8a12926..cc95fac66449 100644
--- a/drivers/clk/stm32/clk-stm32mp25.c
+++ b/drivers/clk/stm32/clk-stm32mp25.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/bus/stm32_firewall_device.h>
+#include <linux/bitfield.h>
 #include <linux/clk-provider.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
-- 
2.54.0