hevc: Add names for reserved NAL unit types

While not yet used, these NAL units do already have some defined
semantics and are referred to elsewhere.

(cherry picked from commit 3daaa441)

libavcodec/hevc.h

@@ -35,12 +35,28 @@ enum HEVCNALUnitType {
     HEVC_NAL_RADL_R     = 7,
     HEVC_NAL_RASL_N     = 8,
     HEVC_NAL_RASL_R     = 9,
+    HEVC_NAL_VCL_N10    = 10,
+    HEVC_NAL_VCL_R11    = 11,
+    HEVC_NAL_VCL_N12    = 12,
+    HEVC_NAL_VCL_R13    = 13,
+    HEVC_NAL_VCL_N14    = 14,
+    HEVC_NAL_VCL_R15    = 15,
     HEVC_NAL_BLA_W_LP   = 16,
     HEVC_NAL_BLA_W_RADL = 17,
     HEVC_NAL_BLA_N_LP   = 18,
     HEVC_NAL_IDR_W_RADL = 19,
     HEVC_NAL_IDR_N_LP   = 20,
     HEVC_NAL_CRA_NUT    = 21,
+    HEVC_NAL_IRAP_VCL22 = 22,
+    HEVC_NAL_IRAP_VCL23 = 23,
+    HEVC_NAL_RSV_VCL24  = 24,
+    HEVC_NAL_RSV_VCL25  = 25,
+    HEVC_NAL_RSV_VCL26  = 26,
+    HEVC_NAL_RSV_VCL27  = 27,
+    HEVC_NAL_RSV_VCL28  = 28,
+    HEVC_NAL_RSV_VCL29  = 29,
+    HEVC_NAL_RSV_VCL30  = 30,
+    HEVC_NAL_RSV_VCL31  = 31,
     HEVC_NAL_VPS        = 32,
     HEVC_NAL_SPS        = 33,
     HEVC_NAL_PPS        = 34,