more bpmpfw shenanigans

Source/hoc-clk/bpmpfw/source/libc/src/fslc_strlen.c

@@ -0,0 +1,9 @@
+#include "fslc_string.h"
+
+size_t fslc_strlen(const char *str)
+{
+    size_t res = 0;
+    for(; *str; ++str) ++res;
+
+    return res;
+}