Install the linux(4) man page also for aarch64

[trasz]

Summary

Previously it was only installed on i386 and amd64.

[emaste]

linux.4 also needs some updating, e.g.

To compile support for this ABI into an i386 kernel place the following
line in your kernel configuration file:

      options COMPAT_LINUX

for an amd64 kernel use:

      options COMPAT_LINUX32

Alternatively, to load the ABI as a module at boot time, place the
following line in loader.conf(5):

      linux_load="YES"

[trasz]

(Tinderboxed.)

[gbe]

LGTM

share/man/man4/Makefile

 /* firmware activation without reset */
 #define NVME_CTRLR_DATA_FRMW_ACT_WO_RESET_SHIFT         (4)
 #define NVME_CTRLR_DATA_FRMW_ACT_WO_RESET_MASK          (0x1)
 
 /** log page attributes */
 /* per namespace smart/health log page */
 #define NVME_CTRLR_DATA_LPA_NS_SMART_SHIFT              (0)
 #define NVME_CTRLR_DATA_LPA_NS_SMART_MASK               (0x1)
+/* extended data for Get Log Page command */
+#define NVME_CTRLR_DATA_LPA_EXT_DATA_SHIFT              (2)
+#define NVME_CTRLR_DATA_LPA_EXT_DATA_MASK               (0x1)
 
 /** AVSCC - admin vendor specific command configuration */
 /* admin vendor specific commands use spec format */
 #define NVME_CTRLR_DATA_AVSCC_SPEC_FORMAT_SHIFT         (0)
 #define NVME_CTRLR_DATA_AVSCC_SPEC_FORMAT_MASK          (0x1)
 
 /** Autonomous Power State Transition Attributes */
 /* Autonomous Power State Transitions supported */