fix(cdev): keep ioctl arg as unsigned long across all callers

The Windows-shim PR widened cdev::CDev::ioctl()'s `arg` parameter from
`unsigned long` to `uintptr_t` (and propagated the change to
uORB::DeviceNode and px4_ioctl). On 32-bit ARM NuttX targets uintptr_t
is `unsigned int`, which is a different type than `unsigned long` and
breaks every external override of this method:

  src/drivers/px4io/px4io.cpp:133:25:
  error: 'int PX4IO::ioctl(file*, int, long unsigned int)' marked
  'override', but does not override

This regressed Linux ubuntu:22.04 / 24.04, all NuttX seed targets,
the px4_fmu-v5x/v6xrt CodeQL analyses, and the Checking jobs for
nxp_mr-tropic, nxp_tropic-community, px4_fmu-v5x, px4_fmu-v6xrt.

The NuttX kernel ioctl callback signature is `unsigned long arg` and
all in-tree callers (px4io, IridiumSBD, lib/drivers/device/CDev) match
that. Revert the four signatures back to `unsigned long`. The Windows
shim's ioctl(2) implementation in
platforms/posix/src/px4/windows/posix/sys/ioctl.cpp already uses
`unsigned long`, so no Windows-side change is needed.

Signed-off-by: Nuno Marques <n.marques21@hotmail.com>

platforms/common/include/px4_platform_common/posix.h

@@ -117,7 +117,7 @@ __EXPORT int 		px4_open(const char *path, int flags, ...);
 __EXPORT int 		px4_close(int fd);
 __EXPORT ssize_t	px4_read(int fd, void *buffer, size_t buflen);
 __EXPORT ssize_t	px4_write(int fd, const void *buffer, size_t buflen);
-__EXPORT int		px4_ioctl(int fd, int cmd, uintptr_t arg);
+__EXPORT int		px4_ioctl(int fd, int cmd, unsigned long arg);
 __EXPORT int		px4_poll(px4_pollfd_struct_t *fds, unsigned int nfds, int timeout);
 __EXPORT int		px4_access(const char *pathname, int mode);
 __EXPORT px4_task_t	px4_getpid(void);

platforms/common/uORB/uORBDeviceNode.cpp

@@ -209,7 +209,7 @@ uORB::DeviceNode::write(cdev::file_t *filp, const char *buffer, size_t buflen)
 }
 
 int
-uORB::DeviceNode::ioctl(cdev::file_t *filp, int cmd, uintptr_t arg)
+uORB::DeviceNode::ioctl(cdev::file_t *filp, int cmd, unsigned long arg)
 {
 	switch (cmd) {
 	case ORBIOCUPDATED: {

platforms/common/uORB/uORBDeviceNode.hpp

@@ -114,7 +114,7 @@ public:
 	/**
 	 * IOCTL control for the subscriber.
 	 */
-	int ioctl(cdev::file_t *filp, int cmd, uintptr_t arg) override;
+	int ioctl(cdev::file_t *filp, int cmd, unsigned long arg) override;
 
 	/**
 	 * Method to publish a data to this node.

src/lib/cdev/CDev.hpp

@@ -146,7 +146,7 @@ public:
 	 * @param arg		The ioctl argument value.
 	 * @return		OK on success, or -errno otherwise.
 	 */
-	virtual int	ioctl(file_t *filep, int cmd, uintptr_t arg) { return -ENOTTY; };
+	virtual int	ioctl(file_t *filep, int cmd, unsigned long arg) { return -ENOTTY; };
 
 	/**
 	 * Perform a poll setup/teardown operation.

src/lib/cdev/posix/cdev_platform.cpp

@@ -312,7 +312,7 @@ extern "C" {
 		return ret;
 	}
 
-	int px4_ioctl(int fd, int cmd, uintptr_t arg)
+	int px4_ioctl(int fd, int cmd, unsigned long arg)
 	{
 		PX4_DEBUG("px4_ioctl fd = %d", fd);
 		int ret = 0;