Revert "posix: device_io: implement fdopen()"

This reverts commit 581a0f56e6.

PR #73978 introduced a regression.
Unfortunately this PR cannot be reverted without reverting also
Let's revert both PRs to stabilize main again towards the 3.7 release.

For more details on the issue see
https://github.com/zephyrproject-rtos/zephyr/issues/75205

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

lib/os/fdtable.c

@@ -403,17 +403,6 @@ int zvfs_close(int fd)
 	return res;
 }
 
-FILE *zvfs_fdopen(int fd, const char *mode)
-{
-	ARG_UNUSED(mode);
-
-	if (_check_fd(fd) < 0) {
-		return NULL;
-	}
-
-	return (FILE *)&fdtable[fd];
-}
-
 int zvfs_fstat(int fd, struct stat *buf)
 {
 	if (_check_fd(fd) < 0) {

lib/posix/options/device_io.c

@@ -5,7 +5,6 @@
  */
 
 #include <stddef.h>
-#include <stdio.h>
 #include <stdint.h>
 
 #include <zephyr/posix/poll.h>
@@ -14,7 +13,6 @@
 
 /* prototypes for external, not-yet-public, functions in fdtable.c or fs.c */
 int zvfs_close(int fd);
-FILE *zvfs_fdopen(int fd, const char *mode);
 int zvfs_open(const char *name, int flags);
 ssize_t zvfs_read(int fd, void *buf, size_t sz, size_t *from_offset);
 ssize_t zvfs_write(int fd, const void *buf, size_t sz, size_t *from_offset);
@@ -47,11 +45,6 @@ int close(int fd)
 FUNC_ALIAS(close, _close, int);
 #endif
 
-FILE *fdopen(int fd, const char *mode)
-{
-	return zvfs_fdopen(fd, mode);
-}
-
 int open(const char *name, int flags, ...)
 {
 	/* FIXME: necessarily need to check for O_CREAT and unpack ... if set */