Updated device-shadow submodule to support named shadow, and updated demo to use named shadow (#636)

lexicon.txt

@@ -1478,6 +1478,7 @@ pcrestcommand
 pcrootdir
 pcrxbuffer
 pcrxedchar
+pcshadowname
 pcsource
 pcstatusmessage
 pcstring
@@ -2198,6 +2199,9 @@ sfprld
 sfr
 sfsrootcag
 sha
+shadow
+shadowname
+shadownamelength
 shadowstatus
 shasum
 shigherprioritytaskwoken
@@ -2373,6 +2377,7 @@ testcases
 testloop
 testrunnerafqp
 testrunnerfull
+testshadowname
 testthingname
 testval
 tex
@@ -2451,6 +2456,7 @@ uartcommandconsole
 uartlite
 uarts
 ubasetype
+uc
 uca
 ucautoreloadtimercounters
 ucbaddnsresponseh
@@ -2486,6 +2492,7 @@ ucrequest
 ucrequesttype
 ucrotaskfaulttracker
 ucsha
+ucshadownamelength
 ucsharedbuffer
 ucsharedmemory
 ucsharedmemoryn
@@ -2493,6 +2500,7 @@ ucslaveaddress
 ucsrb
 ucsrc
 uctempbuffer
+ucthingnamelength
 ucxbrf
 ucxbrs
 udp
@@ -3376,4 +3384,4 @@ yyyy
 yyyymmddhhmmss
 zc
 zer
-zynq
+zynq