tools/refresh.sh: Add option to refresh all archs or all chips

Currently when we modify some Kconfig related to some chip or
some architecture we need to run refresh.sh to all boards that
is too slow (more than one hour to finish).

This patch modify the script to update only the boards configs
of an specific chip or only the boards of an specific architecture.

Examples:

$ ./tools/refresh.sh --silent --defaults arch renesas
  Normalize us7032evb1/ostest
  Normalize us7032evb1/nsh
  Normalize skp16c26/ostest
  Normalize rx65n-rsk2mb/netnsh
  Normalize rx65n-rsk2mb/ipv6
  Normalize rx65n-rsk2mb/nsh
  Normalize rx65n-rsk1mb/netnsh
  Normalize rx65n-rsk1mb/nsh
  Normalize rx65n-grrose/netnsh
  Normalize rx65n-grrose/ipv6
  Normalize rx65n-grrose/nsh
  Normalize rx65n/nsh

It updates the boards from all 'renesas' architecture (m9c, rx65n, sh1)

$ ./tools/refresh.sh --silent --defaults chip rx65n
  Normalize rx65n-rsk2mb/netnsh
  Normalize rx65n-rsk2mb/ipv6
  Normalize rx65n-rsk2mb/nsh
  Normalize rx65n-rsk1mb/netnsh
  Normalize rx65n-rsk1mb/nsh
  Normalize rx65n-grrose/netnsh
  Normalize rx65n-grrose/ipv6
  Normalize rx65n-grrose/nsh
  Normalize rx65n/nsh

It updates all the boards from renesas chip 'rx65n' family

tools/refresh.sh

@@ -68,10 +68,12 @@ while [ ! -z "$1" ]; do
     echo "  --help"
     echo "     Show this help message and exit"
     echo "  <board>"
-    echo "     The board directory under nuttx/boards"
+    echo "     The board directory under nuttx/boards/arch/chip/"
     echo "  <config>"
-    echo "     The board configuration directory under nuttx/boards/<board>/configs"
-    echo "  Note: all configuration is refreshed if <board>:<config> equals all."
+    echo "     The board configuration directory under nuttx/boards/arch/chip/<board>/configs"
+    echo "  Note1: all configuration is refreshed if <board>:<config> equals all."
+    echo "  Note2: all configuration of arch XYZ is refreshed if \"arch namearch\" is passed"
+    echo "  Note3: all configuration of chip XYZ is refreshed if \"chip chipname\" is passed"
     exit 0
     ;;
   * )
@@ -107,6 +109,18 @@ fi
 
 if [ "X${CONFIGS}" == "Xall" ]; then
   CONFIGS=`find boards -name defconfig | cut -d'/' -f4,6`
+else
+  if [[ "X${CONFIGS}" == "Xarch "* ]]; then
+    array=(${CONFIGS})
+    ARCH=${array[1]}
+    CONFIGS=`find boards/${ARCH} -name defconfig | cut -d'/' -f4,6`
+  else
+    if [[ "X${CONFIGS}" == "Xchip "* ]]; then
+      array=(${CONFIGS})
+      CHIP=${array[1]}
+      CONFIGS=`find boards/*/${CHIP} -name defconfig | cut -d'/' -f4,6`
+    fi
+  fi
 fi
 
 for CONFIG in ${CONFIGS}; do