docs: Update documentation generation with missing entries

This adds missing entries for documentation generation, both for tests
and the API reference.

The list of tests is made complete and ordered alphabetically, with
modified descriptions for consistency.

More files are added to the API reference, with a minimalistic
description block added to them when it was missing.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@linux.intel.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
diff --git a/lib/igt_gvt.c b/lib/igt_gvt.c
index 4ab7433..a78e98e 100644
--- a/lib/igt_gvt.c
+++ b/lib/igt_gvt.c
@@ -31,6 +31,13 @@
 #include <unistd.h>
 #include <fcntl.h>
 
+/**
+ * SECTION:igt_gvt
+ * @short_description: Graphics virtualization technology library
+ * @title: GVT
+ * @include: igt_gvt.h
+ */
+
 static bool is_gvt_enabled(void)
 {
 	bool enabled = false;
diff --git a/lib/igt_primes.c b/lib/igt_primes.c
index d5232e5..3578a3c 100644
--- a/lib/igt_primes.c
+++ b/lib/igt_primes.c
@@ -28,6 +28,13 @@
 #include <string.h>
 #include <math.h>
 
+/**
+ * SECTION:igt_primes
+ * @short_description: Prime numbers helper library
+ * @title: Primes
+ * @include: igt_primes.h
+ */
+
 #define BITS_PER_CHAR 8
 #define BITS_PER_LONG (sizeof(long)*BITS_PER_CHAR)
 
diff --git a/lib/igt_rand.c b/lib/igt_rand.c
index b8d3a92..664a476 100644
--- a/lib/igt_rand.c
+++ b/lib/igt_rand.c
@@ -1,5 +1,12 @@
 #include "igt_rand.h"
 
+/**
+ * SECTION:igt_rand
+ * @short_description: Random numbers helper library
+ * @title: Random
+ * @include: igt_rand.h
+ */
+
 static uint32_t global = 0x12345678;
 
 uint32_t hars_petruska_f54_1_random_seed(uint32_t new_state)
diff --git a/lib/igt_x86.c b/lib/igt_x86.c
index f40b9a2..6f03849 100644
--- a/lib/igt_x86.c
+++ b/lib/igt_x86.c
@@ -40,6 +40,13 @@
 #include "igt_x86.h"
 #include <stdio.h>
 
+/**
+ * SECTION:igt_x86
+ * @short_description: x86 helper library
+ * @title: x86
+ * @include: igt_x86.h
+ */
+
 #define BASIC_CPUID 0x0
 #define EXTENDED_CPUID 0x80000000
 
diff --git a/lib/sw_sync.c b/lib/sw_sync.c
index c05a787..7bd7670 100644
--- a/lib/sw_sync.c
+++ b/lib/sw_sync.c
@@ -41,6 +41,13 @@
 #include "drmtest.h"
 #include "ioctl_wrappers.h"
 
+/**
+ * SECTION:sw_sync
+ * @short_description: Software sync (fencing) support library
+ * @title: SW Sync
+ * @include: sw_sync.h
+ */
+
 struct int_sync_create_fence_data {
 	__u32	value;
 	char	name[32];