Added support for parsing symbol table(s)

Able to locate and parse the sections containing the symbols in the
ELF-file. Spec limits the valid sections containing symbols to the
following 2 sections.
  - SYMTAB : Standard symbol table section.
  - DYNSYM : Dynamic linker symbol table section.

Signed-off-by: Chinmay V S <chinmay.v.s@pathpartnertech.com>