Add missing libdrm bits from upstream after 6cafa0b

In file included from cmrtlib/linux/hardware/cm_device_os.cpp:24:
cmrtlib/linux/../linux/hardware/drm_device.h:254:19: error: use of undeclared identifier 'DRM_MAJOR'
    return maj == DRM_MAJOR;
                  ^

cmrtlib/linux/hardware/drm_device.h

@@ -61,6 +61,26 @@
 #define MAP_FAILED ((void *)-1)
 #endif
 
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
+#define DRM_MAJOR 145
+#endif
+
+#ifdef __NetBSD__
+#define DRM_MAJOR 34
+#endif
+
+#ifdef __OpenBSD__
+#ifdef __i386__
+#define DRM_MAJOR 88
+#else
+#define DRM_MAJOR 87
+#endif
+#endif /* __OpenBSD__ */
+
+#ifndef DRM_MAJOR
+#define DRM_MAJOR 226 /* Linux */
+#endif
+
 #define DRM_DEV_UID  0
 #define DRM_DEV_GID  0
 /* Default /dev/dri directory permissions 0755 */
@@ -514,6 +534,7 @@ get_pci_path(int maj, int min, char *pci_path)
         *term = 0;
 }
 
+#ifdef __linux__
 static int parse_separate_sysfs_files(int maj, int min,
     drmPciDeviceInfoPtr device,
     bool ignore_revision)
@@ -650,19 +671,19 @@ static int parse_config_sysfs_file(int maj, int min,
 
     return 0;
 }
+#endif
 
 static int drmParsePciDeviceInfo(int maj, int min,
     drmPciDeviceInfoPtr device,
     uint32_t flags)
 {
-//#ifdef __linux__
+#ifdef __linux__
     if (!(flags & DRM_DEVICE_GET_PCI_REVISION))
         return parse_separate_sysfs_files(maj, min, device, true);
 
     if (parse_separate_sysfs_files(maj, min, device, false))
         return parse_config_sysfs_file(maj, min, device);
     return 0;
-/*
 #elif defined(__OpenBSD__) || defined(__DragonFly__)
     struct drm_pciinfo pinfo;
     int fd, type;
@@ -692,7 +713,6 @@ static int drmParsePciDeviceInfo(int maj, int min,
     #warning "Missing implementation of drmParsePciDeviceInfo"
         return -EINVAL;
 #endif
-*/
 }
 
 static int drmParsePciBusInfo(int maj, int min, drmPciBusInfoPtr info)