ARM: 6792/1: SPEAr: Replace SIZE macro's with SZ_4K macros

Resource size required mostly is 4K for all devices, whereas currently
reserved space is much beyond that. This patch replaces SIZE macro's used at
multiple places with SZ_4K.

Reviewed-by: Stanley Miao <stanley.miao@windriver.com>
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Rajeev Kumar <rajeev-dlh.kumar@st.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>