PCI: Change pdev->rom_attr_enabled to single bit

Make 'rom_attr_enabled' a single bit in a bitfield and move it close to an
existing bitfield so that they can be merged.

This field is only used in 'drivers/pci/pci-sysfs.c' to store 0 or 1.

On x86_64, this shrinks the size of 'struct pci_dev' by 8 bytes from 3560
to 3552.

Link: https://lore.kernel.org/r/d7a34ad369336db73145c3efbade895e792a0ad3.1687105455.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Author: tititiou36

include/linux/pci.h

@@ -464,12 +464,12 @@ struct pci_dev {
 	unsigned int	no_vf_scan:1;		/* Don't scan for VFs after IOV enablement */
 	unsigned int	no_command_memory:1;	/* No PCI_COMMAND_MEMORY */
 	unsigned int	rom_bar_overlap:1;	/* ROM BAR disable broken */
+	unsigned int	rom_attr_enabled:1;	/* Display of ROM attribute enabled? */
 	pci_dev_flags_t dev_flags;
 	atomic_t	enable_cnt;	/* pci_enable_device has been called */
 
 	u32		saved_config_space[16]; /* Config space saved at suspend time */
 	struct hlist_head saved_cap_space;
-	int		rom_attr_enabled;	/* Display of ROM attribute enabled? */
 	struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file for resources */
 	struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file for WC mapping of resources */