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rtcd: make include guard unique

prior numbers were removed resulting in the same include guard for
vp[89]_rtcd

Change-Id: If2741e5b0cbdda7390c20e865e9f05992caff93e

--- a/build/make/rtcd.sh

+++ b/build/make/rtcd.sh

@@ -196,8 +196,9 @@

 # Helper functions for generating the arch specific RTCD files

 #

 common_top() {

-  outfile_basename=$(basename ${symbol:-rtcd.h})

-  include_guard=$(echo $outfile_basename | tr '[a-z]' '[A-Z]' | tr -c '[A-Z]' _)

+  outfile_basename=$(basename ${symbol:-rtcd})

+  include_guard=$(echo $outfile_basename | tr '[a-z]' '[A-Z]' | \

+    tr -c '[A-Z0-9]' _)H_

   cat <<EOF

 #ifndef ${include_guard}

 #define ${include_guard}