Initial version with softvol,Route,Multi,Dmix

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+Softmixer controller for 4A (AGL Advance Audio Architecture).
+------------------------------------------------------------
+
+ * Object: LUA API Documentation
+ * Status: In Progress
+ * Author: Fulup Ar Foll fulup@iot.bzh
+ * Date  : April-2018
+
+## Sound Cards
+
+User may define as many sound card as needed. All sound cards will be group within one global multi channels card.
+As a result, declaring three USB stereo sound card is equivalent to declare one Renesas GEN3 with 6 channels
+
+```
+    -- Sound Card Definition
+    -- ==========================
+    -- local sndcard_sample = {
+    --
+    -- * Mandatory UID will be the ALSA PCM
+    --     ["uid"]= "YAMAHA-APU70",  
+    --
+    -- * Mandatory Card might be found by either its devpath, its cardid or cardindex (should provide only one)
+    --     ["devpath"]= "/dev/snd/by-xxx/xxxx, (any path in /dev/snd pointing to a valid sndcard control works
+    --     ["cardid"]  = "hw:xx",  [xx] may either be a card index or a name (eg: hw:USB)
+    --     ["cardidx"] = N,
+    --
+    -- * Optional Device and subdev
+    --     ["device"] = N, (default 0)
+    --     ["subdev"] = N, (default 0)
+    --
+    -- * Mandotory List of sink channels attached to the card
+    --     ["sink"] = {
+    --         [0]= {["uid"]= "front-right", ["port"]= 0},
+    --         [1]= {["uid"]= "front-left", ["port"]= 1},
+    --     }
+    -- }
+```
+
+Sound card should be group in a table in order to request grouping as a multi channel PCM. Note that this grouping 
+relies on ALSA 'multi' plugin and thus inherit of its limits. 
+
+```
+  local sndcards= {
+        [0] = sndcard_0,
+        [1] = sndcard_2,
+        [3] = sndcard_3,
+    }
+```
+
+Call 
+
+```
+    error= L2C:snd_cards (source, sndcards)
+    if (error ~= 0) then 
+        AFB:error (source, "--InLua-- L2C:sndcards fail to attach sndcards=%s", Dump_Table(sndcards))
+        --goto OnErrorExit
+    else
+        AFB:notice (source, "--InLua-- L2C:sndcards done response=%s", Dump_Table(response))
+    end
+```
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