AM3517:Fix for ARM Relocation support

Also change the CONFIG_SYS_TEXT_BASE to 0x80008000, required
with relocation support. This is the load address for primary
boot loader (x-loader).

Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>