arm: fix implicit use of asm/sizes.h in plat-s5p/plat-samsung

arm: fix implicit use of asm/sizes.h in plat-s5p/plat-samsung

To several variations of messages similar to this:

arch/arm/plat-s5p/dev-onenand.c:25: error: 'SZ_128K' undeclared here (not in a function)
arch/arm/plat-s5p/dev-onenand.c:30: error: 'SZ_8K' undeclared here (not in a function)
arch/arm/plat-samsung/dev-wdt.c:25: error: 'SZ_1K' undeclared here (not in a function)
arch/arm/plat-s5p/dev-ehci.c:23: error: 'SZ_256' undeclared here (not in a function)

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>