Cherry-pick: Integrating Changes from PR #99, #102 and #115 #133
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Add AArch64 R-profile soft nofp variants (LE and BE) - (cherry picked from #102)
Add logic to multilib.yaml to handle cases of armebv7a_soft_nofp and armebv7a_hard_vfpv3_d16 variants- (cherry picked from #99)
Remove -mno-unaligned-access flag from AArch32 big endian variants -(cherry picked from #115)