armv7: start.S: fixes and enhancements for SPL
- Allow SPL to have .bss disjoint from rest of the image - Allow for .bss setup in CONFIG_SPL_BUILD case too. - Take care of the special case where relocation offset = 0. - Compile out exception handling code and install a simpler vector Signed-off-by: NAneesh V <aneesh@ti.com> Signed-off-by: NSandeep Paulraj <s-paulraj@ti.com>
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