feat(common): add SZ_* macros

Add the SZ_* macros from 32 to 2G.
This allows removing some defines in raw NAND driver
and STM32MP1 boot device selection code.

Change-Id: I3c4d4959b0f43e785eeb37a43d03b2906b7fcfbc
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Vishnu Banavath <vishnu.banavath@arm.com>
Signed-off-by: Arpita S.K <Arpita.S.K@arm.com>