SPEAr: Fix ARM relocation support

SPEAr: Fix ARM relocation support

While the u-boot code is running from the flash, it is essential that no access
is made to the bss segment. This is due to the fact that .rel.dyn and .bss areas
overlap and former contains information used in relocation. In SPEAr, this was
not taken into consideration. As a result, while the relocation wasn't complete,
dram_init populated an uninitialized global variable resulting in corruption of
.rel.dyn area, which resulted in u-boot crash.

This commit fixes this problem by removing code that accesses bss segment

Signed-off-by: Amit Virdi <amit.virdi@st.com>
Acked-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>