hlte: Clean up warnings in DT

Change-Id: If64b28b708ce9498164cefcd0ba21df8044c4636
add support for gcc 4.8
use of swp{b} is deprecated for ARMv6+
make it compile with CONFIG_CPU_FREQ_LIMIT disabled
make it compile with CONFIG_SEC_DEBUG disabled
make it compile with CONFIG_SEC_DEBUG enabled
fix build warnings