Remove the unused macro NDEBUG
Remove the unused macro NDEBUG

The C standards specify that this macro is used to
disable asserts but, in our code, the assert macro
is controlled with ENABLE_ASSERTIONS. Having this macro
here creates confusion about the behaviour of assert.

Change-Id: Iab8689a14dc2b8790729857d56585ce43c0c4f51
Signed-off-by: Roberto Vargas <d75e640c49defb97bd074f828210df57ed181e1f@arm.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware