[PATCH] mlxbf-bootctl: fix the build error with FIELD_PREP()

rsh_log_store() calls the FIELD_PREP() macro without including the
required header file, resulting a build error:

  CC      drivers/platform/mellanox/mlxbf-bootctl.o
drivers/platform/mellanox/mlxbf-bootctl.c: In function ‘rsh_log_store’:
drivers/platform/mellanox/mlxbf-bootctl.c:429:16: error: implicit declaration of function ‘FIELD_PREP’ [-Wimplicit-function-declaration]
  429 |         data = FIELD_PREP(MLXBF_RSH_LOG_TYPE_MASK, MLXBF_RSH_LOG_TYPE_MSG);
      |                ^~~~~~~~~~

Fix this by including the <linux/bitfield.h> file.

Fixes: e9d1b2d0f7d0 ("mlxbf-bootctl: Add sysfs file for BlueField boot log")
Signed-off-by: Nikolay Kulikov <[email protected]>
---
 drivers/platform/mellanox/mlxbf-bootctl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/platform/mellanox/mlxbf-bootctl.c b/drivers/platform/mellanox/mlxbf-bootctl.c
index f67c7f56ab2b..9ddc7fa1a973 100644
--- a/drivers/platform/mellanox/mlxbf-bootctl.c
+++ b/drivers/platform/mellanox/mlxbf-bootctl.c
@@ -10,6 +10,7 @@
 
 #include <linux/acpi.h>
 #include <linux/arm-smccc.h>
+#include <linux/bitfield.h>
 #include <linux/delay.h>
 #include <linux/if_ether.h>
 #include <linux/iopoll.h>

---
base-commit: 36b1d3299d0b6aa51485cc9a79b8d94948d5f3d4
change-id: 20260810-mellanox_fix_implicit_declaration-b3be803cbe94

Best regards,
--  
Nikolay Kulikov <[email protected]>