Remove some warnings when using checkpatch with --strict option
Remove some warnings when using checkpatch with --strict option

Some checks are ignored as they do not match TF-A coding rules:
PREFER_KERNEL_TYPES, USLEEP_RANGE
or MISRA:
COMPARISON_TO_NULL, UNNECESSARY_PARENTHESES

Change-Id: I335ede89fc872a6169028552d1ba9312fc61a0ba
Signed-off-by: Yann Gautier <e753f6969c288905606e3c07464886d4f1fc1be0@st.com>

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