armv7: do not relocate _start twice
The _start symbol is already relocated, so do not add the relocation the second time in c_runtime_cpu_setup. This fixes e.g. the abort exception handling path, which ended in double fault due to bad address in VBAR. Signed-off-by: NVincent Stehlé <v-stehle@ti.com> Reported-by: NLubomir Popov <lpopov@mm-sol.com>
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